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Sand shark : ウィキペディア英語版
Sand shark

Sand sharks, also known as sand tiger sharks, grey nurse sharks or ragged tooth sharks, are mackerel sharks of the family Odontaspididae. They are found worldwide in temperate and tropical waters. The three species are in two genera.
==Description==
The body tends to be brown with dark markings in the upper half. These markings disappear as they mature. Their needle-like teeth are highly adapted for impaling fish, their main prey. Their teeth are long, narrow, and very sharp with smooth edges, with one and on occasion two smaller cusplets on either side. Sand sharks have a large second dorsal fin. The sand shark can grow up to long, and most adults can weigh around . The average lifespan of both sexes is only about 7 years, though they may live longer in captivity.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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