Here are the answers for the questions above. There are 32 different kinds of dolphins 6 kinds of porpoises and 5 different river dolphins that live in different rivers. Porpoises have teeth that are shaped like a spade and they have long sharp upper edges. Dolphins teeth are like cones and are pointed. Porpoises also have smaller bodies.
Dolphins live and are found in every ocean in the world.
Dolphins echo to find their food and the fish. They use whistle like sounds to alert and communicate with the other dolphins. They use clicks to rebound off of objests and that tells them if they have something in front of them like boats,fish, and other things. Yes, there are 5 differents kinds of dolphins that live in 5 different fresh water areas. The rest of them live in the salt waters.