Archive for the ‘Primates’ Category

Altruism in Chimps

Monday, February 1st, 2010

Here’s a tale to help warm the hearts of those of us fed up with the frozen-pipe, leaky-roof, where-is-the-sun-anyway winter blues. It’s a story about altruistic behavior in chimps. Researchers interested in altruism studied behavior of chimps in captivity and in the wild. In captivity, a chimp will unlock a door when it sees that another chimp can enter and get food when the chimp doing the unlocking has no access to the food. Some researchers said this was just because the chimps’ behavior had been altered by its proximity to humans. I guess they thought the chimp learned altruism from its keepers. Hmmm, I don’t know about that.

Juvenile chimps have a long period of dependency on their mothers who protect them from aggression, feed them and teach them how to feed themselves, make sure they catch up when the group is on the move, and initiate them into the intricacies of chimp social life. Losing a mother is often fatal to the baby chimp. Researchers observed that in the wild there were instances when an unrelated chimp would adopt and care for an orphaned baby. In the cases they observed, ten out of eighteen adoptive parents were male! Male chimps do not usually participate in child care. Caring for the orphans required a lot of time and energy from the adoptive parents. Some researchers objected to the conclusion that this is altruism. They said that the chimps adopted the orphans hoping for future payback in terms of food sharing and grooming. They said maybe the chimps mistook the orphans for their own offspring. Are you kidding me? Chimps live in groups that are highly socially organized and they do not get mixed up about whose baby is whose. And furthermore, who is to say that human “altruism” is not based on subtle hope for future payback? Or even the here-and-now payback of feeling good about oneself?

My heart-warming tale has turned into a rant, I guess. Many animal researchers seem to want to demonstrate that humans are unique and superior to all other animals. They set up these milestones to delineate the border of what is human and what is not. There was tool-making, you may remember. Oops, chimps and even crows make tools. There is the matter of language. Well, the more we learn about gorillas and chimps and even parrots and whales, the less unique human language seems. In a way, human altruism has been the last stand of these folks. I do not understand why it is so threatening to think of all forms of life as existing on a continuum. Why not just think of ourselves as an amazing kind of animal with some really special skills? That’s good enough for me. Here is the link to the article. Now I have to apply my human talents to the problems of leaky roofs and frozen pipes.

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Empathy

Tuesday, October 13th, 2009

Wouldn’t the world be a better place if everyone had more empathy? I have heard many stories of pain, from both the receiving and the giving end. More empathy may not put an end to all that but it certainly would have to decrease the suffering people inflict on each other.

The Wall Street Journal’s September 25 issue had an article by their science correspondent Robert Lee Hotz in which he summarized and discussed some research about empathy. Empathy is not solely a human attribute and he cites examples of primates, elephants, whales and even the lowly mouse showing what might be seen as empathic behavior. One cute experiment was about contagious yawning, you know how observing a yawn can make a person yawn almost against their will. They rigged up a computer animation of a chimp yawning and showed it to chimps who responded by, you guessed it, yawning. Interestingly, people with autism don’t yawn when they see others yawn. I wonder how career criminals would do on this test of empathy.

He goes on to cite other studies of brain imaging that show which brain regions are involved in the experience of empathy. I wonder what lights up in the brains of psychotherapists while they are listening to their patients’ painful stories.

His article is an interesting read though he is mistaken to consider chimps to be the same as monkeys, when they are primates. Also, he falls into the “bigger is better” trap in discussing brains. He makes a big deal about how much bigger our brains are than the chimps. Although true, it is a leap to assume it has anything to do with emotional intelligence as he states.
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More Monkey Business

Thursday, June 11th, 2009

OK, so you are a low-ranking Capuchin monkey and all the big boys and girls in the gang are hogging up all the bananas. What options do you have? It has already been established that you can’t out-bully the bullies. But being low-ranking doesn’t mean that you can’t outsmart the bullies. So, after carefully placing yourself within banana-grabbing range, you let out the alarm cry that every self-respecting monkey recognizes. Its the Capuchin version of “Hey, there’s an ocelot over there, watch out!!” The bullies take to the trees and you get a banana. Pretty slick trick. Could be evidence that the monkeys are doing some sophisticated cognitive processing to come up with this deception. Check it out with this link.

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How About Laughing Apes

Wednesday, June 10th, 2009

For those among you who are thinking this blogger should lighten up a bit after asking you to evaluate your drinking, contemplate life and death and endure a rant about Western Medicine, well, this one’s for you. We all know that human children and some adults laugh when tickled. So do apes which you can see and hear on this link. The researchers are serious about their study of the evolution of vocalization and laughter in primates but I just think its fun.
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Male Chimps Trade Food For Sex

Thursday, April 16th, 2009

I have a long-standing interest in animal behavior, especially that of monkeys and apes. My first exposure to the study of chimpanzee behavior was through Jane Goodall’s book “In the Shadow of Man” in 1972. I had the privilege of attending a presentation she gave at the Cleveland Museum of Natural History in the early 80’s. I learned many things from her talk, including how to hoot like a chip (something I do not practice in polite company!). I was hooked and have been following primatology ever since, so I am sure this will be a recurring topic in this blog. Why do I find the study of primates so fascinating? Its fun to look for similarities between primate and human behavior and it is quite amazing to realize how many behavioral patterns we share with these close genetic relatives.

The study I am reviewing for this post is about food and sex in the chimpanzee world. Here are the facts you need to know to appreciate this study. The diet of chimps consists of primarily plants and insects. Chimps do hunt and eat meat but this is more of a “treat” than a staple in their diet. The other fact is that female chimps are only sexually receptive when they are in estrus, similar to dogs and cats.

Now let’s talk about the study. It was observed that sometimes male chimps share the meat from their hunting efforts with females in estrus and receive a sort of preferential mating status from this behavior. Statistically, these males are more likely to be accepted as partners and therefore more likely to pass on their genes through offspring. Think of it as sort of trading food for sex. The researchers made an observation that males were also giving meat to females who were not in estrus. Why would the males do this if there were no behavioral benefit? The researchers kept track of which male gave food to which female and then looked at the mating patterns of the females when they did come into estrus. The surprising result was that the females remembered which males shared meat with them and when they came into estrus, gave these males more opportunity for mating. Is this a chimpanzee version of courtship or seduction?

Obviously, there are lots of limitations to extrapolating from these animal studies to human behavior, but it is still fun to think about. The media has had a lot of fun with this study, check out this link for some intersting commentary and headlines.