Esbensen, Barbara Juster creator New York 1st. ed. 32 p. 0 x 0.07 x 8 inches (hardcover) What do dogs, pigs, whales, and people have in common? They are all mammals. Whales may seem like enormous fish, but they are really mammals like dogs and pigs and people. They breathe air through lungs, they are warm-blooded, and they have hair. Baby whales even drink milk—just like people do! Animal Habits Mammals Whales Children's Literature Non-Fiction 0060215518 124454