Aquatic animal
Animal that lives in water for most or all of its lifetime / From Wikipedia, the free encyclopedia
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"Aquatic animals" redirects here. For the QI episode, see List of QI episodes.
An aquatic animal is any animal, whether vertebrate or invertebrate, that lives in water for all or most of its lifetime.[1] Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults. Aquatic animals may breathe air or extract oxygen from water through specialised organs called gills, or directly through the skin. Natural environments and the animals that live in them can be categorized as aquatic (water) or terrestrial (land). This designation is polyphyletic.