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 ...

Animal-welfare science tries to get inside the minds of a huge range of species — in order to help improve their lives. Credit...Photo Illustration by Zachary Scott Supported by By Bill Wasik and ...

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 ...