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There are many different types of animals. The common animals most people know are only about 3% of the animal kingdom. When biologists look at animals, they find things that certain animals have in common. They use this to group the animals in a biological classification.
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.
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 ...
