Schwartz, Karlene V. Formerly, Department of Biology, University of Massachusetts, Amherst, Massachusetts.
- Form and habitat
- Nutrition and development
- Invertebrates and vertebrates
- Animal ancestry
- Links to Primary Literature
- Additional Readings
One of five kingdoms of organisms: Animalia, Plantae, Fungi, Protoctista (or, in part, in some classifications Protozoa), and Procaryotae (bacteria). Animals are eukaryotic multicellular organisms that take food into their bodies and that develop from blastula embryos. More than 30 million species of organisms have been described in all five kingdoms; the animal kingdom includes over 1 million described species. Animal species are organized into phyla (see illustration) that are defined according to comparative patterns of development, body structures, behavior, biochemical pathways, modes of nutrition, and ancestry. See also: Systematics
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