So what’s the difference between a whale, a dolphin, and a porpoise?
They are all cetaceans; dolphins and porpoises are actually types of specialized whales. The term “whale” is often used to refer to the large animals in the group. These can be both baleen whales (the filter feeders) and toothed whales (which hunt single prey).
Dolphins usually have a beak and always have conical teeth that taper to a fine point. Porpoises have no beak and their teeth are flat and spade-shaped.