Of the 8.7 million species on Earth, why are human beings the only one that paints self-portraits, walks on the Moon and worships gods? For decades, many scholars have argued that the difference stems ...

Charles Darwin once noted that natural selection tends to preserve traits that conceal an animal in nature. It can paint camouflage onto their bodies with astonishing quickness: The peppered moth’s ...

Two chimpanzees meeting with each other apparently have a discussion using hand gestures, one of the human-like characteristics of other mammals. (Getty Images) Of the 8.7 million species on Earth, ...

Eli Elster does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...

Add Yahoo as a preferred source to see more of our stories on Google. Meerkats, as well as humans, are part of what researchers called a "premier league" of monogamy. - Martin Schutt/dpa/AFP/Getty ...

Add Yahoo as a preferred source to see more of our stories on Google. Guest Opinion. Altruism is helping without a benefit and sometimes at a risk to one’s self. Animals helping others of their own ...