Animal Kingdom can be split up into main groups, vertebrates (with a backbone) and invertebrates (without a backbone). When you think of an animal, you usually think of something like a cat, a dog, a mouse, or a tiger.

All told, around 800,000 species have been identified in the Animal Kingdom -- most of them in the Arthropod phylum.

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Animals are of two types, vertebrates (with a backbone) and invertebrates (without a backbone).
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