Megalodon, meaning "big tooth", is an extinct species of mackerel shark that lived approximately 23 to 3.6 million years ago, during the Early Miocene to the Pliocene. It was formerly thought to be a member of the family Lamnidae and a close relative of the great white shark. The megalodon was a massive shark. The largest were roughly 60 feet in length and attained perhaps up to 50 tons, the size and weight of a railroad car. Female megalodons were, on average larger, at about 44 to 56 feet (13-17 m) and males were about 34 to 47 feet (10-14 m). A more reliable way of estimating the size of megalodon shows the extinct shark may have been bigger than previously thought, measuring up to 65 feet, nearly the length of two school buses. Earlier studies had ball-parked the massive predator at about 50 to 60 feet long.

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