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.