One can only imagine the psychological and emotional states of research chimpanzees who have been poked, prodded, and confined for a good portion of their lives. No doubt, once relieved from the burdens of medical testing, many chimpanzees have a difficult time adapting to "normal" life. But as a recent small-scale…
Orangutans, the most distant of our great ape relatives, changed less in 15 million years than our species has in 200,000. And yet orangutans also have tremendous genetic diversity, an apparent contradiction that has created a strange evolutionary riddle.
Our closest relatives - including chimpanzees, gorillas, and orangutans - have long been considered fundamentally less intelligent than humans. But that could soon change.