Skip to main content
Biology LibreTexts

10: Animals

Animals are multicellular, eukaryotic organisms of the kingdom Animalia. All animals are motile (i.e., they can move spontaneously and independently at some point in their lives) and their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their lives. All animals are heterotrophs: they must ingest other organisms or their products for sustenance.