The biggest animal that has ever lived is the blue whale- it is even larger than the biggest dinosaurs were. Blue whales can weigh as much as 150 cars!
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The big difference between these animals is that monkeys have long tails, but apes don't have tail at all. There are a lots of different kinds of monkeys, but the only apes are gorillas, orang-utans, chimpanzees and gibbons.
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Although sharks and dolphins look alike, they belong to two very different animal groups. Sharks are a kind of fish, but dolphins are members of another groups, the mammals.
Shark:
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Frogs usually have smooth skin and long legs for leaping. Most toads have lumpy skin and move their short thick bodies about by crawling.