A rhesus macaque on Cayo Santiago, which is less than a mile east of Puerto Rico. Rhesus macaques spend upwards of 20 percent of their time engaged in cooperative behaviors like grooming. Andi ...

For a long time, people saw the animal world as a place where only the fastest, strongest, and most aggressive survived. But years of watching animals in the wild are showing a more complex story. In ...

Unlike humans, frogs and other amphibians don't need to rely on their lungs to breathe; their unique skin helps them exchange oxygen and drink. But how do frogs breathe and drink through their skin?

While an increasingly small number of people, especially academic researchers, try to argue that nonhuman animals (animals) don’t really make friends, most people, including both researchers and ...