Roughly half of the howler monkeys in the research preserve have died or remain unaccounted for. Scientists had been studying them for more than 30 years. 

A study finds two species of guenon monkeys in Tanzania have been mating and producing fertile offspring for generations.

Researchers have captured footage of wild chimpanzees teaching each other to use tools, lending support to the idea that humans aren’t the only primates to engage in social learning.

Tigers Forever, High Moon Over the Amazon, Earth from Space, and Medicine's Michelangelo

The Bonobo and the Atheist, The Philadelphia Chromosome, Lone Survivors, and Paleofantasy