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Today, elephant is the biggest animal. The mass of an elephant reaches 5 tons. However the history knows an elephant which weight reached 11 tons. The smallest species of elephants are Asian elephants. Elephants live in families. Pregnancy of a female elephant lasts 22 months and it is the longest pregnancy among all animals. The weight of a newborn elephant makes about 120 kilograms. Elephants have the biggest brain among land animals therefore it`s easy to train them.