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Head-on view of a red lion-fish
Fish come in many shapes and sizes. This is a sea dragon (kira), a close relative of the seahorse. They are camouflaged as floating seaweed.
Dunkleosteus, a giant armoured arthrodire of the later Devonian. Up to 6 metres long, it lived in the Inland seas of North America.
This is one of the first works of art: a sculpture of a fish; age: about 40,000 years ago.

Fish (plural: fish or fishes) are a group of animals with bones which live in water and respire (get oxygen) from their gills.

Fish used to be a class of vertebrates. Now the term covers five classes of animals that live in the water:

Jawless fish
Armoured fish
Cartilaginous fish
Ray-finned fish
Lobe-finned fish

There are more fish than four-limbed animals: there are over 33,000 described species of fish. Fish are usually covered with scales. They have two sets of paired fins and several unpaired fins. Most fish are cold-blooded (poikilotherm).

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