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Fun Fact About Sharks

Fun Fact About Sharks

Shark, any of various species of cartilaginous fishes of predatory habit that constitute the order Selachii (class Chondrichthyes).

Sharks, together with rays and skates, make up the subclass Elasmobranchii of the Chondrichthyes. Sharks differ from other elasmobranchs, however, and resemble ordinary fishes, in the fusiform shape of their body, and in the location of their gill clefts on each side of the head. Though there are exceptions, sharks typically have a hard skin that is dull gray in color and is roughened by toothlike scales. They also usually have a muscular, asymmetrical, upturned tail; pointed fins; and a pointed snout reaching forward and over a crescentic mouth set with sharp angular teeth. Sharks have no swim bladder and must swim enduringly to keep from sinking to the depths.

There are more than 400 living species of sharks, taxonomically grouped into 14–30 families, according to many experts. Numerous larger species can be fatal to humans. Many sharks are fished commercially. However, overfishing in the late 20th and early 21st centuries substantially reduced the populations of some shark species.

Shark specie