Denyse O'Leary

It used to be: Dog vs. cat, Who’s smarter? Now it’s Bird vs. reptile: Who’s smarter? Experts on the fascinating world of animal intelligence are locked in a debate over whether number of neurons or brain volume indicates intelligence (cognitive capacity): In previous work, [Pavel] Němec and colleagues showed that birds have high neuronal densities. “They basically compensate, with these densely packed neurons, [for] the fact that they have relatively small brains in absolute terms, but they have just as many neurons as mammals,” he says. But they didn’t know whether that was true of reptiles as well. In the new study, the researchers found that reptiles have very low neuronal densities, with an average neuron number 20 times lower Read More ›

In a recent experiment, researchers determined that chimpanzees need to be taught how to use stones to crack nuts; individuals don’t grasp the idea for themselves. In a series of four experiments, 35 parties of chimps were given oil palm nuts and stones but “on no occasion did the chimpanzees crack or eat either oil palm or Coula nuts,” presumably because they did not know how. Then the primatologists go on to draw an amazing conclusion: Their culture is therefore more similar to human culture than often assumed… “Our findings suggest that chimpanzees acquire cultural behaviors more like humans and do not simply invent a complex tool use behavior like nut cracking on their own,” says Koops. The presence of Read More ›