cow shark

noun

any of several sharks constituting the family Hexanchidae, having six or seven gill openings on each side of the head.

cow shark

noun

Also called: six-gilled shark. any large primitive shark, esp Hexanchus griseum, of the family Hexanchidae of warm and temperate waters

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The bluntnose sixgill shark, also known as the cow shark, can grow to 26 feet in length and is listed as “near threatened” by the International Union for Conservation, according to Wikipedia.