13.3-million–13.6 million-year-old fossils from an extinct relative of the howler monkey show signs of being the first leaf-eating primate in South and Central America. Fossils from jaws of Stirtonia ...

Two monkeys that are native to the forests of South America are thriving at an East Texas animal sanctuary after getting rescued from being people's pets. Two marmosets, George and Cali, are now ...

In the Amazon and Atlantic forests, field research is seeking new ways to understand the behavior of mammals like monkeys and sloths that depend on the treetops to move around and survive in different ...