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From Citizendium, the Citizens' Compendium

Animalia also called Metazoa is the taxonomic kingdom which includes all animals. All animals are multi-cellular, with the cells enclosed in membranes and organised in a complex manner; almost all can move on their own, and all rely on eating other organisms in order to sustain their lives. Humans are include in the animalia kingdom biologically (we are mammals, we belong to the phylum (the next division) chordata) but in everyday speech humans are not generally spoken of as animals.