The conferences have the following major recurring themes:

• To reassess the relationship between the animal and environmental movements in light of climate change and other jointly-held threats and concerns;
• To examine how humans identify and represent nonhuman animals in art, literature, music, science, and in the media and on film;
• How, throughout history, the objectification of nonhuman animals and nature in science and society, religion and philosophy, has led to the abuse of nonhuman animals and how this has since been interpreted and evaluated;
• To examine how the lives of humans and companion and domesticated nonhuman animals are intertwined, and how science, human and veterinary medicine utilise these important connections;
• How the study of animals and society can better inform both the scientific study of animals and community activism and advocacy; and,
• How science and community activism and advocacy can inform the academic study of nonhuman animals and society.

Minding Animals International has the following patrons: Marc Bekoff, John Coetzee, Jane Goodall, Dale Jamieson, Jill Robinson and Peter Singer. Several of them will speak at this year’s conference.

This year the conference will be held from 3 to 6 July and is hosted by the Ethics Institute and Faculty of Veterinary Science at Utrecht University. There are multiple themes that will be covered in parallel sessions:

• The Human-Animal Relationship
• Animal Capacities
• Animal Welfare
• Animal Ethics
• Animals and Sustainability
• Animals and Public Policy

For more information on the conference and how to register, click here.

Cover of the Dutch translation

The book describes 47 special cases of some form of friendschip or affection between members of two different animal species. We read about an elephant and a sheep who are inseparable, a cockatoo who carresses a cat, a baby rhesus macaque and a pigeon who sleep next to each other (see the picture of the cover), and a pitbull dog who protects and loves chicks. Also presented is the story about the signing gorilla Koko and her kitten All Ball, as well as the friendship between the orangutan Tonda and the cat T.K. (see my post “Great apes and their attitude towards other animals”). The relationships of affection between animals across the species barrier are all of a recent date and come from all over the world. Each story has some magnificent pictures of these animals, some of which are normally each other’s natural enemies. It’s an inspiring book about exceptional relationships between animals who belong to different species and is thus an example for us humans. A great book to get or give.

The second book I’d like to give attention to here is So klug ist ihr Hund [This clever is your dog]. It is written by Juliane Kaminski and Juliane Bräuer, researchers at the Max Planck Institute for Evolutionary Anthropology at Leipzig University, who both do a lot of studies about the cognition of dogs and other animals. It has only recently been published, so there is no translation yet, but I wanted to mention it here for those who can understand German well. This is because it is a really good book, which discusses in a way that is is understandable to everyone the recent knowledge about dogs and their cognition or intelligence. Besides information about the origins and domestication of dogs and their natural communication, the book presents the current scientific state of the art about the various aspects of cognition in dogs. There is a chapter about the understanding of the seeing of others by dogs, a chapter about the interpretation by dogs of human communicative signals, about the knowledge of dogs about the material world they live in, and the differences in cognition of various dog breeds are also discussed. Of course, it also includes the research with Rico and other border collies, who can understand hundreds of human words for all kinds of objects. Besides all this fascinating information, the book also contains several small tests that you can carry out with your own dog to determine whether he or she is capable of certain cognitive feats. And this book too has many great pictures of dogs, as well as about the various studies that are currently being done on the globe with various species of dogs. So if German is not a problem for you, than this book is a must-have for anyone who likes to know more about the intelligence of dogs.

• Jennifer S. Holland. (2011). Unlikely friendships: 47 remarkable stories from the animal kingdom. New York: Workman Publishing Company. 210 pagess.
• Juliane Kaminski en Juliane Bräuer. (2011). So klug ist ihr Hund. Stuttgart: Kosmos. 160 pages.

Border collies

The dogs I’m talking about are border collies. In the history of the human domestication of dogs, the border collies have been selected for their ability to herd cattle, in particular sheep. They originate in the border area between England and Scotland (therefore the name ‘border’). They have los of energie, show great speed and agility and are used in all kinds of dog sports. And they’re very intelligent. In the classification by Stanley Coren the border collie is supposed to be the most intelligent dog (followed by the poodle and the German shepherd).

Research by Juliane Kaminski

Early 2000s Juliane Kaminski, doctor in psychology at the Department of Developmental and Comparative Psychology of the Max Planck Institute for Evolutionary Anthropology at Leipizg University in Germany, heard about a border collie named Rico, who could understand up to 200 human words for toy objects. The woman who took care of him, Susanne Baus, had started learning Rico words when he was 10 months old and had to recover from an operation and couldn’t be left of the leash outside. She showed him a toy, like a stuffed animal, a ball, told him what the word for it was and by repeating this often enough, the woman could eventually ask Rico to bring the object in various rooms of the house. Kaminski was very interested and set up a good study to find out if Rico truly understood the words.

Clever Hans

In order to do so, the Clever Hans effect had to be prevented. This term in science stands for the presence of human cues that can explain a seemingly intelligent behaviour of an animal. It is named after the horse Kluger Hans in Germany, who at the beginning of the last century was famous as a miracle horse. Hans could count, subtract and multiply, tell time, spell out words and more, by tapping his hoof or moving his head. The German psychologist Oskar Pfungst subsequently investigated the horse and he came to the conclusion that the horse was very good in reading the body language of the humans who stood around him. At first the humans would often watch in a tense way when he had been given a question, and when Hans had reached the right number with his hoof, the humans would relax, thereby giving Hans a signal that he should stop tapping his hoof. Maybe Rico was observing his human companion in a similar way and had he not learned words for objects, but was following unconscious human cues.

Rico understands 200 words, Betsy 340

To prevent the Clever Hans effect, Kaminski set up her study as follows. The researcher was in one room together with Rico and Susanne Baus, the woman who took care of him. Before that, Kaminski had put ten objects in a random order on the floor of another room. Baus then had to ask Rico to bring an object, without being able to see the objects and without knowing in what order Kaminski had put them in the other room. Rico went to the other room and fetched the objects correctly. Rico thus had not been able to use human cues to find the right object and had to have an understanding that the human words referred to the objects. After these first 10 objects, the procedure was repeated with another 10 objects and so on. Eventually Rico was able to understand 200 human words for objects. Words like Banane, BigMac, Weihnachtsmann, Hund, Kamel and Zitrone. Kaminski published her study in 2004 in Science and Rico became famous as the dog who understands hundreds of human words. Shortly after that, Kaminski heard of a border collie in Austria, Betsy, who also could understand words and she determined that she could even understand more than 340 human words. Below you see a short film from a BBC documentary about dogs, in which you see Rico and Betsy (in the last few minutes of the film).

Chaser: 1,022 words!

Early this year John Pilley and Allison Reid, two psychologists from Wofford College in South Carolina (USA) published a study with the border collie Chaser in Behavioural Processes. When Kaminski published her work with Rico in 2004, Pilley became intrigued by the question how mány words a border collie is able to comprehend. He got Chaser when she was 8 weeks old and when she was 5 months old he started training her for three years, training Cahser for 4 to 5 hours a day in learning words for objects (the psychology professor Pilley was enjoying his retirement and so had the time for this). Just like the woman who had taught Rico words, Pilley showed Chaser an object, said “This is a …” and repeated this many times a day until Chaser would correctly bring the object. Pilley interspersed this intensive training with lots of loving attention and play with Chaser. In the eventual test of Chaser’s knowledge, care was taken again to prevent unconscious human cueing, by having the objects spread out in another room. Eventually, Chaser demonstrated comprehension of the high number of 1,022 different words for all kinds of toys, many stuffed animals and puppets in all kinds of sizes, balls and frisbees and various kinds of plastic toys. Pilley even went one step further and taught Chaser also the words toy, ball and frisbee. These are not individual names of objects, but categories of objects. Chaser successfully fetched toys if she was asked for that (in a setup with 8 toys and 8 non-toys), and similarly was able to bring balls or frisbees. For balls and frisbees Chaser is able to understand three different labels for an object: its individual name, if it’s a toy or not, and if it’s a ball or a frisbee. Click here for a YouTube film of Pilley and Chaser, in which Chaser shows her understanding of the word ball.

Border collies are thus capable of understanding hundreds of human words and are in that sense comparable to the great apes. In particular of the bonobo Kanzi it has been demonstrated by Sue Savage-Rumbaugh that he could understand hundreds of human words for objects and actions. Border collies are clever, intelligent dogs who have been selected by humans for their ability to cooperate and communicate with humans, which may also to some extent explain their abilities in these studies with words.

The search for the Dutch Chaser

Of course I am very curious to know whether there are border collies in The Netherlands who can understand many human words. If so, I am planning on replicating Kaminski’s studie with a Dutch border collie. If you have a border collie who understands many words, or know someone else with such a dog, please contact me!

References

• Stanley Coren. (1993). The intelligence of dogs. Free Press.
• Juliane Kaminski, Josep Call & Juliane Fischer. (2004). Word learning in a domestic dog: Evidence for fast mapping. Science, 304, 1682-1683.
• John Pilley & Alliston Reid. (2011). Border collie comprehends object names as verbal referents. Behavioural Processes, 86, 184-195.
• E. Sue Savage-Rumbaugh, Jeannine Murphy, Rose A. Sevcik, Karen E. Brakke, Shelly L. Williams & Duane M. Rumbaugh. (1993). Language comprehension in ape and child. Monographs of the Society for Research in Child Development, 58, (3-4, Serial No. 233).

The organization of the lecture day was well taken care of, and the audience was very enthousiastic and motivated. I could notice that they already had a large knowledge about many things. Next year I will return for a presentation about animal ethics.

Several people took pictures and videos of me while I was lecturing. Below you will find two short videos of me during my presentation. Unfortunately the volume is very low, but it gives an impression of my teaching.

Language research with great apes

When Darwin published his evolution theory in the 19^th century and, in doing so, argued for a biological kinship between humans and other apes, scientists became very interested to study the differences and similarities between humans and other great apes. One of these issues concerned the question whether nonhuman great apes could learn some form of human language. At the beginning of the 20^th century, scientists first started experiments in which they tried to teach great apes a spoken language. This was not successful, however. The best result came from the chimpanzee Viki, who in the 1950s, after 6 years of intensive training, learned to pronounce, with great difficulty, the words “papa, mama, cup” and “up.” Often she spoke them hoarse and almost inaudible and Viki also often used the words for the wrong referents.

In the 1960s, after extensive research had demonstrated that human sign language is just as complex as, and equal to human spoken language, scientists tried to teach language to apes by using sign language. They succeeded in teaching signs to apes and the apes used them in their communication with humans.

The chimpanzee Washoe, the first great ape to learn signs

The first ape who was taught signs was in 1966 the chimpanzee Washoe, who eventually learned about 150 signs that referred to all kinds of objects and actions. The success with Washoe led to other projects with signing apes: in 1972 a project started with the gorilla Koko, in 1973 another project with a chimpansee, Nim Chimpsky, and in 1978 with the orangutan Chantek. Besides this, scientists also taught chimpanzees and bonobos to use lexigrams to communicate: geometric symbols that refer to certain objects and actions. The famous bonobo Kanzi has, from the beginning of the 1980s, learned to use several hundred lexigrams.

Characteristic of most of these language projects was that the researchers tried to make these often young apes grow up in an environment that mimicked as much as possible the environment in which a human child grows up, considering that in such an environment the apes would have the best chance of picking up human language. For this reason the apes often grew up in a human family, they were dressed in clothes, learned how to brush their teeth and use a toilet, and they learned discipline and helped in keeping the house clean, by being asked things like helping with the dishes. Of course there was also lots of play with the apes and they were given dolls and other toys to play with. In the 1970s the signing apes were also regularly taken out in a car to walk outside in nature or to visit McDonalds and other places for some snacks.

In the human environment in which these apes grew up, they also came into contact with cats, dogs and other animals. In many cases these were the pets of the people in which house the apes lived. In the literature about these language projects with great apes one can find interesting information about how these apes related to other animals.

Koko and All Ball

Famous is the story about the signing gorilla Koko and her kitten All Ball. This kitten was a Manx cat, which Koko had chosen herself from a litter of abandoned kittens. Because the kitten had no tail, Koko named her, according to the researcher Penny Patterson, ALL BALL. Koko was delighted with her kitten, she petted him, played with him and did so carefully. Koko described her kitten as SOFT GOOD CAT. After several months All Ball died after a car accident and when Penny told Koko that her kitten was dead, Koko would have signed CRY, SAD and FROWN, as an expression of her grief. Watch a short  film about Koko and All Ball below.

I have to mention here, though, that not all claims that have been done by Penny Patterson about Koko’s signing are correct. In 1995 I paid a working visit to the Gorilla Foundation in Woodside, California, where Koko lives since the end of the 1970s. There I was given access to the Koko diaries in which all sign use by Koko was written down from the beginning of Project Koko. I discovered that Patterson had sadly been very selective in what she published about Koko’s signing. Sign utterances that seemed meaningful or languagelike were published, but all other, less meaningful utterances were not. Thus, I found in the unedited, unpublished data that Koko was sometimes bothered daily to make signs such as CRY, SAD and SMILE, often by presenting her with pictures and images. Koko then signed CRY CRY to a picture of a smiling man, BIRD. SAD CRY SAD CRY to a picture of a snake, and SAD CRY DEVIL to a picture of a horse. One should therefore not take the published sign utterances by Koko too seriously, given that the published data on her sign use are not reliable.

After All Ball, Koko was given a few other cats, which she related to lovingly, and which she called LIPSTICK and SMOKE, according to Patterson. Koko was also very interested in a blue jay and in several tree frogs.

The chimpanzee Nim Chimpsky

The chimpanzee Nim was also very delighted by cats. He loved holding a cat and playing with it. Regularly, a cat was brought to the special classroom in which Nim was taught signs. He then became very excited and signed CAT, CAT HUG, CAT ME. If he was then allowed to hold the cat, Nim would get a broad grin of pleasure. The humans then had to take care that Nim wouldn’t pull too hard on the cat’s tail or leg, because Nim often didn’t know his own force. This is true for all the great apes in language research: only under supervision of humans were they allowed to have contact with cats and dogs.

In his book Nim Herbert Terrace describes a fun occasion when the human Susan wanted to feed the cat some yoghurt. Nim enjoyed pretending with humans that he was feeding his dolls. He seemed to understand that that couldn’t hurt, because the dolls wouldn’t eat the food he offered, in which he usually was interested himself. When Susan wanted to feed a spoon of yoghurt to a cat, Nim took the spoon out of her hand and fed the cat himself. However, to his amazement, the cat ate the yoghurt! When Nim was then asked to feed the cat again, he offered the cat an empty spoon and then quickly took himself some yoghurt. Below you can watch a short film about Nim and cats, a short clip from the documentary movie Project Nim, which is now playing in cinemas in the US and the UK.

Nim also liked to play with dogs, whom he would then chase. He also used the sign PLAY to iniate play with cats and dogs and would even use this sign with horses.

The chimpanzee Lucy

Another signing chimpanzee, Lucy, who grew up in the house of Jane and Maurice Temerlin, was given a kitten in order to “develop her maternal instinct.” Lucy turned out to be an overprotective ‘mother’ who would carry her kitten everywhere, even when the cat itself didn’t like this. Roger Fouts describes in his book Next of kin that the cat always tried to escape when Lucy came to her, sadly without success, as Lucy always knew how to catch him. Soon the cat would fall down into a limp heap whenever Lucy came into the room, knowing that Lucy wouldn’t take notice of the cat’s own wishes. Once the cat tried to get away from Lucy by holding onto a wire cage. Lucy, however, pulled him off from there and in doing so damaged the cat’s pads on its paws. The humans took the cat away from Lucy and made it clear to Lucy that she had hurt the cat. When she eventually was given the cat again, Lucy would have taken the cat in her arms, and signed HURT HURT while pointing to the cat’s paws.

Sue Savage-Rumbaugh and the bonobo Kanzi using the lexigram board

The bonobo Kanzi

Kanzi and the other bonobos who were taught to use lexigrams to communicate by Sue Savage-Rumbaugh, also were big pals with dogs. When Kanzi was still young he would also have used lexigrams like “play” to ask the dogs to play with him. When Kanzi was older he seemed to realize that the dogs didn’t react to his lexigram use, so he then stopped using lexigrams with the dogs.

Tearing dogs apart and killing them

According to the researchers from the language projects the signing apes would also sometimes make insulting remarks about other animals. Lucy would have called a local tomcat that she didn’t like DIRTY CAT and the signing orangutan Chantek called noisy birds BAD BIRDS. Koko too, would have signed DARN BIRD and ROTTEN BIRD to a bird who was giving alarm calls for minutes on end.

Observations have also been made of less friendly behaviour by the apes towards other animals. Viki used to enjoy scaring the neighbours’ cats. Several signing chimpanzees have sometimes attacked cats. A Doberman pinscher who was used as a guard dog, was ripped apart by chimpanzees.

The chimpanzee Bruno also was destined to learn signs. He had been sent before Nim to Terrace in New York at the end of the 1960s as a sort of practice ape for his language project. After about half a year Bruno was sent back to the primate institute in Oklahoma where many of the chimpanzees who would learn signs were born. The director of the institute, Bill Lemmon, however, decided that Bruno should quickly be sent off again, this time to a childless couple, to grow up in their house. Poor Bruno, who was then 14 months old, constantly clung to his new foster mother the first few days and apparently wasn’t happy with the whole situation. A few days later he tore apart two fully grown St. Bernard dogs and a few further days later the cow of a neighbour. The dogs survived, but the cow didn’t. After 3 weeks Bruno was sent back to Oklahoma. It is remarkable, by the way, how the great apes in the language projects have been used and moved about all the time, giving little regard to their own well-being.

Nim too showed a less friendly attitude towards a dog when he was older. Nim had had by then a whole history of hardship and suffering. After the experiment with Terrace ended, Nim had been sent back to Oklahoma, where he was sold in 1982 by Lemmon to the biomedical laboratory LEMSIP in New York state, where he was planned to be used in hepatitis research. The press came out with this story and Terrace begun a campaign together with others to liberate Nim and several other chimpanzees from the laboratory. With lots of pressure from public opinion, this campaign was successful and Nim eventually was brought to the Black Beauty ranch of the American animal protectionist Cleveland Amory. (Bruno also ended up in LEMSIP, where he was injected with hepatitis and eventually died there.) On the ranch Nim was bored and lonely. He then had the habit of breaking out of his cage and go to the ranch’s manager’s house, where he’d raid the refrigerator and would lie down in a bed. Once the miniature poodle of the manager was in the house, who came running to Nim while barking hysterically. Nim then grabbed the dog and banged it against the wall several times, covering the place with blood. Elizabeth Hess, in whose book this incident is described, says that Nim killed the dog because he was frightened.

Other great apes in captivity

Besides the great apes in language research, other apes in captivity have also sometimes become friends with a cat or a dog. Already in the 1930s the gorilla Toto was adopted by the French Augusta Hoyt (Toto had been taken from Africa, her mother had been killed in a hunt). Toto also grew up like a human child in the house of Hoyt, who moved to Cuba with the gorilla. When Toto was 4 or 5 years old, she befriended the kitten Principe, which she carried everywhere. Sadly, when Toto became older and less manageable, she was sold to the Ringling Brothers and Barnum and Bailey Circus.

The orangutan Tonda and the cat TK

Eric's impression of Tonda and TK

Of a more recent date is the friendship between the orangutan Tonda and the cat TK. The female Sumatran orangutan Tondalayo lived with another orangutan in the Zooworld zoo in Panama City, Florida. In 2005 her orang companion died, after which Tonda became depressed. She didn’t eat and wasn’t interested in anything anymore. Tonda was already an elderly orangutan and she was not in such good health. For some reason she was considered too old for a new orangutan companion and she was too frail to be sent off to another location. Her human caretakers didn’t know what to do and feared that she might die of misery. They were inspired, however, by Koko’s story and searched a cat that would be appropriate for Tonda: a playful yet docile one-year-old tabby cat T.K. (short for Tonda’s Kitten). The orang and the cat became friends. They ate together and slept together. They played and cuddled and Tonda always watched her cat carefully, the way a mother watches over her child. Tonda also fed the cat and when it was time for a nap, she would take the cat under her blanket. Tonda get very attached to TK and she became angry when her human caretakers took the cat away. Tonda’s health also improved. In 2009 Tonda died quietly, after which the cat TK was down that his companion was no longer there. Click here for a short film about Tonda and TK.

The chimpanzee Anjana and the cubs

Eric's impression of Anjana and a white tiger cub

The Institute of Greatly Endangered and Rare Species (TIGERS) in Myrtle Beach, South Carolina, is a sanctuary that takes care of all kinds of exotic animals and gives education about them. One of their animals is the female chimpanzee Anjana. She was inseparable of her human caretaker China York. Thus, Anjana was present when York took care of other animals, such as two white tiger cubs who were separated from their mother in 2008 after a hurricane. The then 2-year-old Anjana imitated the care of the tiger cubs and related to the cubs in a very friendly way. Anjana would feed them milk, lay with them and act like a surrogate mother. She cuddled them, played with them, enjoyed holding them and when she heard them cry because they were hungry, she stuck a finger in their mouth like a pacifier. Besides these tiger cubs, Anjana has helped raising leopards, lions and orangutans in the sanctuary. Watch a short film about Anjana and the cubs below.

Killing and eating other animals

Besides these friendships between great apes in captivity and other animals, it is also known that all great apes kill and eat animals that have entered their enclosure. They do so with animals such as squirrels, rats, mice, and birds. This was shown in a recent study by Ross, Holmes and Lonsdorf (2009) in which caretakers from all kinds of zoos and sanctuaries in the US and Canada were asked about their observations. Chimpanzees in particular also used the carcass of the animal in their displays towards their conspecifics. Chimpanzees and bonobos more often showed aggressive behaviour towards animals that had entered their enclosure than gorillas and orangutans. Below you can see a short film about chimpanzees in a zoo in St.Louis, hunting a cat in their enclosure.

It is remarkable that gorillas in captivity also kill and eat vertebrate animals, as this has up to now never been observed in wild gorillas. It has been known, however, that gorillas in captivity eat meat from vertebrate animals that they are offered. The signing gorilla Koko also was offered hamburgers and ate them.

The bonobo Kuni and the starling

In contrast with this is the story about the bonobo Kuni and the starling, which is mentioned in several books by Frans de Waal. Somewhere in the 1990s a starling flew against the windows of the bonobo enclosure in the Twycross Zoo in England. The 7-year-old female bonobo Kuni caught the starling, at which a human caretaker urged her to let the starling go. Kuni took the bird outside and put it on its paws, where it remained immobile. Kuni then threw the starling up a bit, but the bird just fluttered a little. Then Kuni took the starling into one hand and climbed to the top of the highest tree in the outdoor enclosure and when she reached the top Kuni held on to it with her feet and then used both hands to unfold the starlings wings carefully, after which she threw the bird as far away as she could in the direction beyond the moat surrounding the enclosure. Unfortunately, the starling still fell just inside the bonobo enclosure. Kuni then climbed down and protected the starling against a curious juvenile bonobo. At the end of the day the starling was nowhere to be seen: it is assumed that the starling had eventually been able to fly away.

Great apes in the wild and other animals

Chimpanzees and baboons

Jane Goodall calls the interactions between chimpanzees and baboons the most varied and complex of any two other species of animals in the animal kingdom. First of all, play often takes place between especially young chimpanzees and young baboons. The play predominantly exists of chasing each other and hitting each other playfully. Often, however, the play ends up in agression. The chimpanzees and baboons then chase each other while stamping and slapping and the chimpanzees throw rocks and sticks at the baboons. Sometimes actual attacks take place, in which the animals hit each other. Besides play, Goodall has also observed the old baboon Job regularly being groomed by chimpanzees. Also, sometimes the baboons startle a chimpanzee, who then utters a threat-bark, causing the baboon to cower submissively. The chimpanzee would then touch the baboon quietly in reassurance.

Gilka and Goblina

In Gombe Goodall was able to observe the special relationship between the chimpanzee Gilka and the baboon Goblina. When Gilka was 4.5 years old she had at that time no other young chimpanzees to play with and her mother Olly was often fishing for termites for hours on end. Gilka therefore became bored and somewhat lethargic. One day she hears a troop of baboons, goes over to them and Goblina comes over to her (Goblina’s mother had died, but she did have enough baboon playmates). Gilka and Goblina look at each other, put an arm around each other and they start playing. They wrestle and pat each other. They tickle each other with their fingers and give each other playful nibbles with their mouth, all accompanied by soft laughter.

Different from the normal play between chimpanzees and baboons, the play between Gilka and Goblina did not become aggressive, it mostly was gentle and careful. The friendship lasted for a full year. Gilka then travels with her mother Olly to another location and only returns after half a year. Goblina had by then reached adolescence (baboons mature quicker than chimpanzees) and had become less playful and the friendship was not revived. Later two adult chimpanzees would kill Goblina’s first child. Goblina watched the event while calling loudly.

Sexual behaviour between chimpanzees and baboons

Goodall also describes sexual behaviours between the chimpanzees and baboons in Gombe. Already when the chimpanzee Flint was 8 months old, did he show interest in the sexual swellings of the female baboons. Often they would then present themselves to him and allowed him to touch their pink bottoms. Female baboons would also present themselves to other interested young, but also adult male chimpanzees.

Young male baboons also get excited by the genital swellings of adolescent female chimpanzees. They grab their ankles and try to copulate. The baboon Ajax mounted the 9-year-old female chimpanzee Moeza, who wasn’t interested, but let him go, because she was sad that her mother had died. Ajax was unsuccessful in actual copulation, however. When Flint was 7 years old he copulated with the female baboon Apple. He showed her his erection, Apple presented herself and copulation took place.

Bonobos and other animals

It has been observed of wild bonobos that they sometimes groom monkeys. Play between bonobos and monkeys has also been observed. In the Wamba area in Congo observations have also been made of bonobos playing in a less friendly way with monkeys. The bonobos seemed to see the apes as toys. They would inspect them, groom them and mount them. They even threw them in the air and swung them with their tails, causing the monkeys to bang their heads. Two young monkeys didn’t survive this rough type of play.

Other animals as food

Many different animals are being eaten as food by great apes. Chimpanzees hunt red colobus monkeys, vervet monkeys, baboons, bushbabies (where the chimpanzees make spears out of branches to impale the bushbabies in hollow trees), bush antelopes, bushbucks, warthogs, bushpigs and even human children. Watch a film about chimpanzees hunting red colobus monkeys below.

Bonobos hunt for redtail monkeys, vervets, black mangabeys, reptiles, insects, earthworms and birds’ eggs. Gorillas in the wild have only been observed to eat invertebrate animals, such as ants, termites, worms, caterpillars and snails. Orangutans eat all kinds of insects, but also small birds and mammals. They hunt grey tree rats, slow loris and even gibbons.

It has to be mentioned, though, that all great apes predominatly eat fruits and plants and other animals make up only a few percentages of their diet. Bonobos and orangutans are more opportunistic hunters, whereas chimpanzees regularly go out together on hunts. Cannibalism has also been observed in all four great apes, where young apes in particular are eaten.

Big cats and great apes

Big cats are the natural enemies of great apes in the wild. Leopards hunt all four great ape species. Lions hunt for chimpanzees and tigers on Sumatra for orangutans. The chimpanzees and bonobos drive the big cats away by hurling sticks, branches and stones and using their intimidation displays. Famous are the experiments by the Dutch ethologist Adriaan Kortlandt, who put a stuffed leopard with a baby chimpanzee doll in its claws. The chimpanzees in reaction used sticks and branches as clubs and lots of aggressive behaviour towards the stuffed leopard. Watch a short film about this experiment below.

Besides big cats, snakes hunt bonobos and crocodiles orangutans. However, for all great apes humans are the most important predator.

Conclusion: They’re just like humans

When we look at the way in which nonhuman great apes relate to cats and other animals, we can conclude the following. Although only humans keep other animals as pets for their own pleasure, nonhuman great apes that live with humans in captivity can get strong ties of affection with cats, dogs and other animals. It is, however, often necessary that the apes are under the supervision of humans when they play with other animals, because the apes often don’t know their own (much greater) strength. Negative attitudes and aggressive behaviour towards other animals also exists in great apes in captivity, where they attack cats and dogs and sometimes even kill them. Usually, however, there is an explanation for this less friendly behaviour: the apes are frightened or feel threatened or have been treated badly by humans. It seems like great apes in captivity are similar to humans: if the apes learn with human guidance to treat cats and dogs well, they will do so. Only when other motives play a part (fear, threat, negligence), will great apes in captivity treat other animals badly, which may also be the case with humans. At the same time, however, all great apes in captivity will kill and eat birds and mammals that have entered their enclosure.

Finally, in the wild, great apes will sometimes play with other animals, but often this turns to aggression. All great apes, and especially chimpanzees and bonobos, will hunt and eat many different animals. We may possibly see a link there with how our own human ancestors related to animals in the past.

Invite me to give this lecture!

If you’d like me to give this lecture at your own organization you can contact me. My email address is: estebanyes@gmail.com

References

- Roger Fouts (with S.T. Mills). (1997). Next of kin. What chimpanzees have taught me about who we are. New York: William Morrow & Company.

- Jane Goodall. (1971). In the shadow of man. London: Wm. Collins.

- Jane Goodall. (1986). The chimpanzees of Gombe. Patterns of behavior. Cambridge, MA: The Belknap Press of Harvard University Press.

- Jane Goodall. (1990). Through a window. My thirty years with the chimpanzees of Gombe. Boston: Houghton Mifflin Company.

- Elizabeth Hess. (2008). Nim Chimpsky. The chimp who would be human. Nerw York: Bantam Books.

- Eugene Linden. (1981). Apes, men, and language. Harmondsworth: Penguin Books.

- Anna Michel. (1980). The story of Nim. The chimp who learned language. New York: Alfred A. Knopf.

- Francine Patterson. (1987). Koko’s story. New York: Scholastic, Inc.

- Francine Patterson & Eugene Linden. (1981). The education of Koko. New York: Holt, Rhinehart and Winston.

- Esteban Rivas. (2003). GIMME GIMME GIMME. The recent signing behaviour of chimpanzees (Pan troglodytes) in interactions with longtime human companions. Radboud Universiteit Nijmegen: proefschrift.

- S.R. Ross, A.N. Holmes & E.V. Lonsdorf. (2009). Interactions between zoo-housed great apes and local wildlife. American Journal of Primatology, 71, 458-465.

- Sue Savage-Rumbaugh, Stuart G. Shanker & Talbot J. Taylor. (1998). Apes, language, and the human mind. Oxford: Oxford University Press.

- Herbert Terrace. (1979). Nim. New York: Alfred A. Knopf.

- Frans de Waal. (2009). The age of empathy. Nature’s lessons for a kinder society. New York: Three Rivers Press.

- Frans de Waal en Frans Lanting (1997). Bonobo. The forgotten ape. Berkeley: University of California Press.

A human great ape and his cat friend Slungel

My lecture on September 25 is titled “Great apes and their pets” and will present the interesting relationships across the species barrier between the famous nonhuman great apes from the language research projects and other animals such as cats and dogs. Well-known is the story about the signing gorilla Koko and her love of kittens. Penny Patterson, her lifetime companion and researcher of Koko’s use of signs, claims that Koko was very sad and signed CRY and SAD when her first kitten All Ball died in a car accident. Besides kittens, Koko also enjoyed the company of a baby blue jay and several tree frogs. The signing orangutan Chantek had a squirrel as pet. Nim Chimpsky, the signing chimpanzee of Herbert Terrace’s project in the 1970s, loved to play with cats and dogs. However, later in his life, after Nim was moved around several institutes and even ended up in the biomedical laboratory LEMSIP for a while, the hardship he went through made him less friendly towards other animals. There is even an account that he killed a miniature poodle. Actually, there is currently a new film on show in the United States and the United Kingdom about the life and fate of Nim Chimpsky. Called Project Nim, by Oscar-winning director James Marsh, the movie shows a lot of footage of Nim and the humans involved in his life are interviewed. The film is based on Elizabeth Hess’s excellent book Nim Chimpsky. The chimp who would be human (2008). Click hereto go to the website about the movie Project Nim and see a trailer. In my lecture I will present both the affectionate and sometimes aggressive attitude of great apes towards other animals.

Affection across the species barrier

Besides the stories about the apes in language research I will also present several relationships between great apes in captivity and cats and dogs. After discussing the way great apes who live in the wild relate to other animals (xenofobic and murderous, but also playing happily with baboons), I will finish with a short presentation of the results that came out of the language research with great apes. I will also show several short films about Koko and Nim playing with cats.

The other lectures of this day are by Els Peeters (The biological origins of cats and their behaviour) and by Marcellina Stolting (Behavioural problems; Socialization of kittens; and Multiple cats households). For more information about this lecture day, click here.

The new blog is called Esteban’s Vegan Side and will contain a discussion of the moral arguments for veganism. Most of all, though, I will publish tasty and delicious vegan recipes. There is still a lot of prejudice out there, considering vegan cooking to be bland and tasteless. I want to show instead that vegan cooking can be surprisingly tasty and good to the palate. I have cooked vegan food for many people who were not vegan, and they always comment how wonderfully surprised they are when they eat my vegan meals. The posts on this blog will be both in English and in Dutch.

I have already posted three recipes on my vegan blog. One for a Moroccan risotto, one for a Spanish gazpacho soup drink, and one for an Indian eggplant curry (Baingan Bartha). I have many more recipes to post. If you’re curious, take a look at my blog!

Click here to register for the course at the Seniorenacademie.

Click here for more information on the course itself (in Dutch).

Klik hier voor dit bericht in het Nederlands op mijn Nederlandse blog.

Marc Bekoff in discussion with the audience

The seminar was organized by Astrid Verkuyl and her colleagues at Dogschool Feedback in Aalsmeer. The seminar itself took place in the tropical garden of Tropisch Rozenland in Burgerveen, where unfortunately enough the airplanes coming and going to Schiphol flew over low, causing the conversation to stop for a while. Otherwise, the organization of the seminar was excellent.

In his seminar Bekoff spoke about the emotions and consciousness of animals, and the moral and play behaviour of animals. He also showed some great videos of playing dogs, coyotes, dolphins, and polar bears. Below I will present some of the interesting things that Bekoff had to say about play in animals.

Charles Darwin already said in The descent of man from 1871 that happiness and pleasure in animals can be seen very well when they play together. Even insects play together: “the lower animals, like man, manifestly feel pleasure and pain, happiness and misery. Happiness is never better exhibited than by young animals, such as puppies, kittens, lambs, etc., when playing together, like our own children. Even insects play together, as has been described by that excellent observer, P. Huber (7. ‘Recherches sur les Moeurs des Fourmis,’ 1810, p. 173), who saw ants chasing and pretending to bite each other, like so many puppies,” p. 61. Where I’d like to mention that nowadays we wouldn’t talk about “lower” animals, the way Darwin does here, but about “other” animals, without there being a ladder from low to high, with humans as the pinnacle. The reference to Huber is something to find out more about, as his research on playing ants sounds very interesting.

Bekoff also said that many birds show play behaviour as well. Play requires cooperation, fairness, on-going negotiations, apology, forgiveness, trust, reading others’ intentions and beliefs (having a theory of mind), and empathy (where Bekoff referred to the possible role of mirror neurons in empathy).

Animals know that they are playing by the following behaviours. First, there are clear play signals, of which the play bow takes place in many animals (dogs and cats, as well as wolves, hyaenas, lions, etc.). These communicative signals are honest in nature. Deceptive use of play signals is extremely rare. Also, in play role reversal takes place. A dominant animal lets him- or herself be dominated in play, like in a chase game where the dominant animal is chased. Furthermore, self-handicapping is shown in play: the animals restrain themselves and don’t bite as hard as they can, but modify it so the playbiting doesn’t hurt. Animals also make continual micro-adjustments of their behaviour in order not to hurt each other. Wildebeests play very roughly, but they take care not to hurt each other with their sharp horns. Finally, the sequences of behaviour during play are very variable: there is hitting, slapping, mounting, jumping and other behaviours. Which is in contrast to for example aggressive behaviour, which is much less variable. In play behaviour we can see behaviours from aggression, mating and predation, but clearly accompanied by play signals and in a variable way.

Marc also showed a very nice video of playing dolphins, studied by Kathleen Dudzinski of the Dolphin Communication Project. Dolphins modify their communicative signals in play. They then approach each other from the side, and not the front, as they do in aggression. There’s also lots of affectionate rubbing with their pectoral fins. He also showed a beautiful video of a polar bear in Brookfield Zoo near Chicago who had grown up without his mother. Another young polar bear showed him his toys in order to get him to play. Eventually the orphan bear started playing at last. Some animals never learn to play again after a trauma like growing up by themselves. By looking at whether animals play or not we can thus learn something about their early development. The emotional well-being of an animal can also be read from its play behaviour.

Eric and the dog Jimmy play with a ball

Animals in the wild play less than domesticated animals. Young wild coyotes play about 2 to 3% and young deer 10% of the time. In the wild there has to be abundant food in order to be able to play, given that play itself costs a lot of energy. Baboon mothers restrict the play of their young when there is less food available. There is also a risk at predation when playing. Domesticated animals are usually provided with enough food and usually don’t run the risk of being the victim of a predator.

Other signals with which dogs, wolves and coyotes initiate play are the following. Besides bowing, they also bark, usually when the play bow has not led to attention from the other animal they want to play with. They also show exaggerated approaches, including a bouncing gait and rushing to one another. They also show face-powing, like a light slap in the face. They approach and withdraw back and forth. And they use subtle movements of the head, eyes, shoulders and whole body.

Bekoff has done extensive research on the play bow. It’s a stereotyped, fixed behaviour that is easy to recognize as a very clear signal that the behaviour that will follow is not aggressive. There are four rules of play in animals: 1. Ask first, 2. Be honest, 3. Mind your manners, and 4. Admit when you’re wrong (for example, dogs make a play bow when they have bitten another to show that they didn’t mean any harm). Marc has also written a fantastic children’s book about play in animals, Animals at play: The rules of the game (Temple University Press, 2008), in which he shows in a clear way the most important aspects of play in animals.

Next Summer Bekoff will be back in The Netherlands. He will then speak at the Minding Animals II conference, which will be held from July 5 to 12, 2012, at the Ethics Institute of the University of Utrecht. This conference will discuss the scientific, ethical and social aspects of humans’ interaction with and use of non-human animals. Click here for more information on the Minding Animals conference. Click here for Marc Bekoff’s website.