Northern muriquis, which live in the Atlantic forest of Brazil, are one of the most endangered species of monkey in the world. Choosing good mates and rearing thriving offspring are key to the species ...

There’s no question that chronic stress can be harmful: Tens of thousands of studies in both humans and model organisms decry its effects, demonstrating its role in the development of depression, ...

Northern muriquis, which live in the Atlantic forest of Brazil, are one of the most endangered species of monkey in the world. To better understand what goes on in the mating lives of muriquis, ...

A northern muriquis sits on a branch in the sunlight. Strier and her team have spent years documenting the unique colorings and patterns of the monkeys' faces to be able to identify each individual.