Animals are multicellular eukaryotic organisms in the biological kingdom Animalia.With few exceptions, animals consume organic material, breathe oxygen, are able to move, reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development.Over 1.5 million living animal species have been described—of which around 1 million are …

Lists of extinct animals; List of transitional fossils; Palaeontology; Prehistory This page was last edited on 4 April 2022, at 19:56 (UTC). Text is available under the Creative Commons Attribution-ShareAlike License 3.0; additional terms may apply. By using this site ...