Monkey

Mysterious "ghost apes" may have interbred with the great apes known as bonobos just as modern humans repeatedly had sex with now-extinct human lineages.

Bea, a white-faced saki monkey, seems as "buff" as a bodybuilder.

Staying at the top of the pecking order is not an easy game for male chimpanzees.

Photos of the critically endangered chimpanzees that call Senegal's Fongoli savanna home.

Colombian researchers hope to revive an endangered species by rehabilitating monkeys confiscated from smugglers. The captive animals' struggles show that survival is not guaranteed.

The extinct Jamaican monkey X. mcgregori mcgregori acted like a sloth and had hardly any teeth. It may have been a seafaring hero.

The remains of the smallest ape ever known to walk the Earth may have been discovered in the hills of Kenya, scientists say.

Months later, one of the little primates is still displaying signs of stress.

Koko, the western lowland gorilla who signed her way into people's hearts, died in her sleep.

Human beds are teeming with more body microbes than the beds of chimpanzees.