She is a bit plumper, he a bit more jowly, and they are both slowing down a little. But as they turn 40, Woodland Park Zoo's twin orangutans still fascinate and amuse generations of visitors. When ...

Critically endangered Bornean orangutans have arrived at the Naples Zoo for the first time in its 50-year history. Now there are four of these red-haired, great apes at the zoo. They were previous ...

In primates, the biggest, bossiest males usually get to father the most offspring; and for a long time it was thought that this rule applied to orangutans too. Male orangutans openly compete; and it’s ...