In a type of relationship known as mutualism, two different species benefit from one another through cooperation. While some ...

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 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, ...