Animals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia. Animals consume organic material, breathe oxygen, have muscle cells, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. With few exceptions, animals are able to move. Animals form a clade, meaning that they arose from a single common ancestor. 05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. 77 million animal species on Earth. 6 m (110 ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology, and the study of animal behaviour is known as ethology.
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1,620,889 species Catalogue of Life COL26.10 · CC BY
Shares counted over species below this taxon. Tree of Life v3d, precomputed counts
Not assessed by the IUCN Red List (or no assessment linked via Wikidata).
Dataset v3d. Classification: Catalogue of Life COL26.10 (CC BY 4.0) and Open Tree of Life (CC0). Each photo is credited where it is shown.