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animal, Any member of the kingdom Animalia ( see taxonomy ), a group of many-celled organisms that differ from members of the two other many-celled kingdoms, the plants and the fungi ( see fungus ), in several ways. Animals have developed muscles, making them capable of spontaneous movement ( see locomotion ), more elaborate sensory and nervous ...
Animal - Multicellular, Heterotrophic, Eukaryotes: A characteristic of members of the animal kingdom is the presence of muscles and the mobility they afford. The muscles that distinguish animals from plants or fungi are specializations of the actin and myosin microfilaments common to all eukaryotic cells.
Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft).
