Research suggests that dolphins develop a lifelong vocal “name.” Here’s how they evolved this high level of social identity, once thought to be uniquely human.

Dolphins live in almost every ocean, except most tend to avoid the cold waters in the Arctic and around Antarctica. Some also live in rivers, including the Amazon River in South America and the Ganges ...

A study of dolphins’ epigenetic ages found that animals with more high-quality friendships were biologically younger than their lonely peers ...