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MAMMALIA belong to dolphins, cetaceans, whale tooth suborder, Dolphin Branch, commonly known as dolphins, whales are smaller, a total of nearly 62 kinds, the distribution of the world's oceans. Body length 1.2 to 4.2 meters and weighing 23 to 225 kilograms. Dolphingeneral, lower jaw on the taper of about 101 teeth, mainly on small fish, squid, shrimp, crabs for food. Dolphin enjoy the "collective" life, at least a few head, while many hundreds of head. Dolphin is a kind of ability Chaoqun, bright sea mammals. After training, you can play table tennis, jumping, such as Ring of Fire. In addition to people outside the dolphin brain are the most developed animals. Human brain account for 2.1 percent of my weight, it accounts for dolphin brain weight of 1.7 ‰. Dolphin completely separated from the brain of two parts, when part of one of the work, another part of the full rest, therefore, can be life-long dolphin does not sleep. Echolocation by dolphins to determine the objectives of the evolution of dolphins dolphins, there are whales and porpoises, are evolved from terrestrial mammals of. It is believed to be for similar types of cloven-hoofed purpose.Now dolphin bones, located in the pelvic Department has two rod-like bone is considered the degradation of the hind limbs. They are about 5000 million years ago to return to the sea life. See the evolution of a whale. All member dolphin Branch
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