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Primates

Intertwined Evolution of Human Brain and Brawn

The cognitive differences between humans and our closest living cousins, the chimpanzees, are staggeringly obvious. Although we share strong superficial physical similarities, we have been able to use our incredible…

A Marmoset Never Forgets

Scientists studying social learning in animals have shown how easy it can be to introduce a new behavior into a group and watch it spread from individual to individual. However,…

Do Monkeys Grieve for Fallen Mates?

The two marmosets—small, New World monkeys—had been a closely bonded couple for more than 3 years. Then, one fateful day, the female had a terrible accident. She fell out of…

Spider Monkey Society is Sexually Segregated

Ew, boys! A species of spider monkey has been found to live in strictly sexually segregated societies, apparently because the males attack the females if they spend too much time…