"The discovery of a new bone in a new species is a rare event, especially in chimps which have such similar anatomy to people," researcher Catrin Rutland said.
Back in 1979, I was looking for gibbons in Khao Yai National Park in Thailand. There in front of us, about 30 feet away, was a large tiger lying in the middle of the trail.
"It is like finding a new fossil of a long-lost ancestor," researcher Chris Petkov said.
Scientists also observed the chimps sharing the tortoise meat between individuals.
Using tools to dig for food underground was once thought to be a behavior unique to humans.
Scientists were surprised to find the genitalia of female dolphins are packed full of nerves.
We know how to find win-win situations.
The 4-year-old Tonkean macaque exhibited prolonged attachment to the infant's desiccated corpse before starting to chew its remains.
Sumatran orangutans remain critically endangered, but their numbers are higher than thought.