Whales live in the ocean. The sperm whale is the largest whale. Whales are mammals so they can’t breathe under water. They have to come up to the surface to breathe air. They breathe through a blowhole on the top of their head. Some sperm whales live to 70 years old. The sperm whale sperm is so big it takes a lot of food to feed him. He feeds on octopus and fish. His favorite is squid.