The interpretation of the observed behavior remains somewhat speculative. It's unclear, for instance, whether any of the chimps were related to each other; kin-selection effects may be at play.

How Wild hits trails around the country, exploring the meaning of wilderness. A century ago, the U.S. set aside the first official wilderness. You'll hear stories from rangers, scientists, hikers ...

NPR's Ari Shapiro talks with scientist Alejandra Ramos, who just led a study about axolotls born in captivity who were released into the wild and survived. We've got some good news for axolotls ...

A mysterious Antarctic squid was found alive for the first time in December. Footage of the unprecedented encounter has now been released.

Wild chimps indulge in booze-fueled feasts, rare video shows. Chimps in Guinea-Bissau were recorded sharing fermented breadfruits in the wild, offering a clue about the origins of social drinking ...

A team of researchers has identified distinct mother-offspring attachment types in wild chimpanzees (Pan troglodytes verus). Drawing parallels with human psychology, the study provides compelling ...