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An animal is a living being. Animals are usually distinguished from plants, but they two are not the only kinds of living beings in the world, there are plenty of others, like fungi, or bacteria, for example.
Most known animals are easy to distinguish, since they have legs, or wings, or fins, or something else (called a limb) they use to move : plants, for example, don't move. Some other animals, like snails, have no limb, but even though they are able to move.
There are so many animals in the world, that it is hard to find a things in common between them all, but there are some... Some have scales, or fur, some have fins, or wings, some live in the water, or on the ground, but all have... a mouth: you can be sure that every animal has a mouth of any sort, and anything that has a mouth is an animal. Yes, that means that you are an animal too, since you have a mouth : the humans are one of the thousands of species in the world. More generally, the word animal is used, however, for any other animal except from human: it is a practical, and not a scientifical word.
A place where a number of different animals are kept, and breed, to be visited by people is called a zoo, from the Greek word zoo, meanings "animal". The humans uses to hunt (the hunting of fishes is called fishing), or to breed animals to eat them, or to exploit other thing from them, like there whoole (in the case of the sheep, for example)...
Classification[edit | edit source]
There are so many different animals, that scientist have to tried to order them in different groups containing similar animals. Some of the most important are:
- the Sponges
- the Cnidarians, including coral, jellyfish and sea anemone
- the Roundworms, a very large group of little known animals, like the giant roundworm
- the Arthropods, including the Insects (like ant or grasshopper), but also the spiders, the scorpions, and the millipedes...
- the Molluscs, including snail, octopus and oyster
- the Annelids, including eathworm and leech
- the Echinoderms, including sea star and sea urchin
- and the Chordates, including fishes, frogs, birds and mammals.
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