By Xiyan
Dolphins are related to whales and porpoises. Dolphins has a fish shaped body but they are mammals. Dolphins have lungs but they have to go to the surface to breath. Dolphins usually are 4 to 30 feet long. They weigh between 100 to 20,00 pounds. Some kinds of dolphins live in rivers. Dolphins have a layer of fat called blubber. Blubber helps the dolphin float and keeps them warm. Dolphins uses sounds to sense the places of underwater objects (My favorite fact!). Dolphins have excellent hearing. Groups of dolphins communicate by making a clicking sound. Most dolphins live in groups. Several kinds of dolphins are endangered. Thank you for reading about dolphin facts!
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