Imagine watching a video of a chimpanzee. The ape pulls its lips back in a wide, playful grin. Without realizing it, the corners of your own mouth twitch upward. You smile back. Scientists call this ...

Humans are not the only animals that communicate. Birds sing to attract mates, dolphins use signature whistles that identify ...

Bonobo male Kikongo making 'happy' grin faces at the Lola ya Bonobo Sanctuary, Democratic Republic of Congo, October 2010 Fiona Rogers / Laughter is universal among humans. Researchers have found ...

For decades, scientists have been studying the cognition of great apes to understand how our own complex cognitive abilities evolved. Much of the research is based on the idea that if a particular ...

Add Yahoo as a preferred source to see more of our stories on Google. Study finds great apes share a laughter rhythm dating back 15 million years, offering clues to how human speech evolved. (CREDIT: ...

Chimpanzees and bonobos hug, touch and kiss before stressful situations, suggesting social reassurance may have evolved millions of years before humans.

NEW YORK (AP) — Humans and great apes have been giggling in similar ways since branching off the evolutionary tree, a new study suggests. The new research reexamined those decades-old recordings and ...