Dolphin

Dolphins are toothed aquatic mammals with streamlined bodies, horizontal tail flukes and a single blowhole. Most live in the sea, while some inhabit rivers. Echolocation helps them locate prey, and calls, whistles and body movements support communication with other dolphins. Fish and squid are important foods for many species, although diets vary. Calves nurse and remain close to their mothers while developing swimming and feeding skills. The group includes small coastal dolphins as well as much larger animals such as orcas.