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Dolphins: Amazing Pictures & Interesting Facts Children Book About Dolphins The Beauty of Dolphins Dolphins are cetacean mammals. Cetacean means "large sea animal" in the Greek language. This means that like humans, dogs and whales, they give birth to live babies instead of laying eggs like fish do. Even if they look like fish, they are mammals. There are many kinds of dolphins. The term "dolphin" is like a family name for the many dolphin species. Also, dolphins are related to other sea mammals like whales and porpoises.