Baby shark Shuh duh fuh cup doo doo doo mug and shirt Sharks usually have 5-7 gills. Many people believe that they must always move the water into the gills, ensuring their respiration, otherwise they will die due to lack of oxygen. But in fact one can keep a shark in a place for so long that the shark can not hurt, as long as it does not panic. This is evident in its relatives, which are often less moving, such as rays.Sharks have a very sensitive olfactory, they can recognize 1 drop of blood in 1 million drops of sea water. Some species, such as the nurse shark, have whiskers around the edges that increase sensitivity to catches. Sharks often rely on the olfactory bulb to find the bait, but in short range, they use both lateral lines to identify motion and sensory holes on their heads to detect electrical waves in water.
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