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Animals are multicellular , eukaryotic organisms of the kingdom Animalia (also called Metazoa ). All animals are motile , meaning they can move spontaneously and independently, at some point in their lives. 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 .
Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion , about 542 million years ago. Animals are divided into various sub-groups, some of which are: vertebrates ( birds , mammals , amphibians , reptiles , fish ); molluscs ( clams , oysters , octopuses , squid , snails ); arthropods ( millipedes , centipedes , insects , spiders , scorpions , crabs , lobsters , shrimp ); annelids ( earthworms , leeches ); sponges ; and jellyfish .
The word "animal" comes from the Latin animalis , meaning having breath , having soul or living being . In everyday non-scientific usage the word excludes humans – that is, "animal" is often used to refer only to non-human members of the kingdom Animalia; often, only closer relatives of humans such as mammals , or mammals and other vertebrates , are meant. The biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges , jellyfish , insects