Delphinidae
The Delphinidae are a family of marine mammals that includes all oceanic dolphins, porpoises, and the pilot whale. With 40 species, it is the largest family of toothed whales. While the term dolphin is often used to refer specifically to the common dolphin and other similar species, it is also used more broadly to include all members of the Delphinidae family.
Common Names
Delphinidae species are commonly known as dolphins, porpoises, or pilot whales. While dolphin is often used to refer specifically to the common dolphin (Delphinus delphis) and other similar species, it is also used more broadly to include all members of the Delphinidae family. Porpoise typically refers to members of the genus Phocoena, while pilot whale refers to the largest member of the family, the long-finned pilot whale (Globicephala melas).
Characteristics
Delphinidae species are generally characterized by their streamlined bodies, fusiform shape, and prominent dorsal fins. They possess a distinct melon on their foreheads, which is used for echolocation. Their jaws are elongated and equipped with conical teeth, and their flippers are relatively small and positioned towards the head. The size and shape of their tails vary considerably between species.
Environments
Delphinidae species are found in all oceans worldwide, and some species are also found in freshwater environments. They are highly social animals that typically live in pods of varying sizes. Their diet consists primarily of fish, squid, and other marine organisms.
References
Wikipedia: Delphinidae
NOAA Fisheries: Dolphins