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Aquatic animal

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).

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Starfish or Sea-stars do not have blood or a brain. Instead of blood they use the seawater. Sea-stars can reproduce asexually or sexually. Fishermen used to cut the Sea-stars in half when they caught them and then threw them back thinking they were killing them. Really they were doubling the population because Sea-stars can reproduce asexually.

Contributed by Jordyn Deak

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