Dolphins and Porpoises

Many people confuse the two, so here is a summary of the differences of these mammals.

Top Porpoise, bottom Dolphin

Feature	Dolphin Characteristic	Difference in a Porpoise
The nose	A dolphin usually has a pointed snout (beak)	A porpoise snout is short and blunt like a cartoon fish sketch (never strongly pointed)
The fin (Some species of both have no fin on their back)	The leading edge of the fin on a dolphin's back is shaped like a curling wave (Called the dorsal fin)	The leading edge of a porpoise's back fin is straight. The porpoise's fin is also triangular like a shark's
The teeth	Dolphins have pointed cone-shaped teeth	Porpoise teeth are flat, spade shaped, with upper edges that are long and sharp
Size	Dolphins grow up to 12 feet long	Porpoises are usually less than 7 feet long
Shape	Dolphins are longer and sleeker in shape	Porpoises are shorter and more compact
Sounds	Dolphins produce sounds we can hear (and are talkative!)	Porpoise sounds are inaudible to us
Behavior	Dolphins have much less fear of humans - will ride the waves alongside boats	Porpoises are shy - you are much less likely to see one - wild or captive. Rarely seen at surface unless up to breathe.
Groups	Dolphins live in large groups	Porpoises live in pods of 2 - 4
Lifespan	Dolphins can live for more than 50 years	Porpoises do not live long past the age of 15

Dolphins are some of the only animals known to have sex for reasons other than reproduction.