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Shark - it is a primitive predatory fish common in all seas and oceans. She торпедообразная shape of the body, of a length of 20 cm to 18 m. Shark-skin is covered with acute scales. Movement forward and turns the fish carries out the curves of the tail to the left or to the right. The eyes are able to see things only in black-and-white image. The teeth of the sharks - a terrible weapon, she grabs, kills its prey and tearing it to shreds.
In contrast to the whale shark холоднокровные beings and breathe with gills. Eat only meat.
Among a lot of sharks and such, which are dangerous for humans. The great white shark is the most terrible hunter-killer. It reaches a length of 7.9 m and weighs about 3,75 t.
Whale shark is the largest one in the Land of fish. It reaches a length of 18 m and weighs about 40 tonnes, feed on plankton. She lived about 70 years.