Portrait Of A Shark In The Aquarium. Royalty-Free Stock Photo

The shark is one of the most ancient representatives of the fauna of the planet. In addition, these inhabitants of the water depths are little studied and have always been considered mysterious creatures. In nature, there are about 500 species of sharks. Representatives of the superorder are widespread in the seas and oceans, from the surface to a depth of more than 2000 meters. Mostly live in sea water, but some species can also live in fresh water. Most of the sharks belong to the so-called real predators, but 3 species - the whale, giant and largemouth sharks - are filter feeders, they feed on plankton, squid and small fish.