<P> An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life . Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults . Aquatic animals may breathe air or extract oxygen from that dissolved in 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). </P> <P> The term aquatic can in theory be applied to animals that live in either fresh water (fresh water animals) or salt water (marine animals). However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc . </P>

What do you call animals live in water