October 13, 2007

A tool-making crow

Evolution gone mad

Shaping of Hooks in New Caledonian Crows
A. A. S. Weir, J. Chappell, A. Kacelnik
Science 297, 981 (2002)

Bird with a wireIn the Brevia section of the 9 August 2002 issue of Science, Weir et al. report a remarkable observation: The toolmaking behavior of New Caledonian crows. In the experiments, a captive female crow, confronted with a task that required a curved tool (retrieving a food-containing bucket from a vertical pipe), spontaneously bent a piece of straight wire into a hooked shape -- and then repeated the behavior in nine out of ten subsequent trials. Though these crows are known to employ tools in the wild using natural materials, this bird had no prior training with the use of pliant materials such as wire -- a fact that makes its apparently spontaneous, highly specific problem-solving all the more interesting, and raises intriguing questions about the evolutionary preconditions for complex cognition. The crow's behavior was captured on an unusual video clip, available on Science Online.

 


Posted on 10/13/2007 8:32 PM Comments (0)

Monkey that walks upright

I'm aware this is old, but this is the kind of thing I'm interested in.

Monkey walks like human

July 22, 2004 - 1:31AM

A young monkey at an Israeli zoo has started walking like a human following a near death experience, the zoo's veterinarian said.

Natasha, a small five-year-old black macaque monkey at the Safari Park next to Tel Aviv, began walking exclusively upright on two legs after a stomach ailment nearly killed her, zookeepers said.

Monkeys usually alternate between upright movement and walking on all fours. A picture in the Ma'ariv daily on Wednesday showed Natasha standing ramrod straight like a human. The picture was labelled humorously: The Missing Link?

Two weeks ago, Natasha and three other monkeys were diagnosed with severe stomach flu. At the zoo clinic, she slipped into critical condition, veterinarian Igal Horowitz said.

"I was sure that she was going to die," he said. "She could hardly breathe, and her heart was not functioning properly."

After intensive treatment, Natasha's condition stabilised, but she exhibited strange behaviour, and a day after was released from the clinic, she began walking erect like a human being.

"I've never seen or heard of this before," said Dr Horowitz. One possible explanation is brain damage from the illness, he said.

Besides her evolutionarily advanced method of movement, Dr Horowitz said, Natasha's behaviour had returned to normal.

AP


Posted on 10/13/2007 8:30 PM Comments (0)
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