The top row shows variation in a zooplankton, Daphnia: the morph on the right is produced in the presence of a predator cue. The second row shows an example of dimorphic variation in horn length, ...

Animals often get labeled as either predators or prey. But in the wild, survival isn’t always a one-animal job. Some species form partnerships that help them find food, avoid danger, or raise young.

The study of animal behavior is a cornerstone of psychology for several reasons. Ethology, or the study of animals in their natural habitats, sheds light on how animals interact with each other and ...