Whales hear from little holes behind their eyes. Whales talk to each other by making high pitched sounds like whistles, clicks, squeaks, rattles, and groans. To help protect the whales from extinction please DO NOT throw nets, fishing lures, or other fishing gear ocean. But dolphins come much closer to the shore. They will come as close to the shore as you or I can walk without going under water.
Dolphins have teeth.
They have nostrils called blowholes. Over millions of years of evoloution whales and dolphins nostrils moved to the top of their head. This allows them to breath by surfacing instead of them sticking their whole head out of the water. The first thing a newborn dolphin must do is to go to the surface to breathe. But the baby can not swim so its mother and a another dolphin will help push the baby to the surface for its first breath of air.