The body shape of Dall's porpoise makes it easily distinguishable from other cetacean species. The animal has a very thick body and a small head. The colouration is rather like that of a killer whale; the main body of the porpoise is very dark grey to black, with very demarcated white patches on the flank and belly.
The finless porpoise lives in the coastal waters of Asia, especially around Japan, Korea, China, Indonesia, Malaysia, India, and Bangladesh. Throughout their range, the porpoises stay in shallow waters, up to 50 m (160 ft) deep, close to the shore, in waters with soft or sandy seabeds, or in estuaries and mangrove swamps.
Some porpoises produce a variety of clicks and whistles, which are thought to be primarily for social purposes. A few species, like the harbour porpoise, are highly sociable, but pods generally do not exceed ten individuals for most species. Porpoises were, and still are, hunted by some countries by means of drive hunting.
The harbour porpoise (Phocoena phocoena) is one of six species of porpoise. It is one of the smallest marine mammals. As its name implies, it stays close to coastal areas or river estuaries, and as such, is the most familiar porpoise to whale watchers.
The vaquita (Spanish: ; Phocoena sinus) is a rare species of porpoise endemic to the northern part of the Gulf of California. The word vaquita is Spanish for "little cow". Other names include cochito (Spanish for "little pig"), desert porpoise, vaquita porpoise, Gulf of California harbor porpoise, Gulf of California porpoise, and gulf porpoise.