One of the mysteries of the English language finally explained.
Treated as plural: animals of the largest size category; especially benthic or soil animals which are at least several centimetres in length, such as vertebrates and large invertebrates; specifically those of a particular habitat, region, etc. Also (with singular concord): a group, class, community, or list of such animals.
Early 20th century. From macro- + fauna. Compare earlier microfauna.
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