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A new study shows that the gigantic Megalodon, or megatooth shark, was warm-blooded: providing the first empirical evidence of warm-bloodedness in the extinct shark. This latest research on the Megalodon, which lived in the world’s oceans from 23 million to 3.6 million years ago and measured about 50 feet in length, appears in the peer-reviewed journal Proceedings of the National Academy of Sciences. The study, conceived of and led by Michael Griffiths and Martin Becker, both professors of environmental science at William Paterson University in New Jersey, used fossil teeth to determine that...

O. megalodon sharks were warm-blooded megapredators. But colder-blooded great white sharks may have had an evolutionary edge when food sources dwindled.

The world's largest-ever marine predator which roamed the seas millions of years ago may have died out because it was warm-blooded.

By Will Dunham WASHINGTON (Reuters) - The megalodon, a huge shark that was the scourge of the ancient oceans and is a star in modern movie theaters, i...

The megalodon, a huge shark that was the scourge of the ancient oceans and is a star in modern movie theaters, is named for its "large tooth" - and for good reason. Its serrated teeth - up to about 7 inches long (18 cm) - could tear through any prey in the deep blue sea. Researchers estimated that megalodon, which reached at least 50 feet (15 meters) and possibly 65 feet (20 meters) long while hunting marine mammals including whales, boasted an overall average body temperature of about 81 degrees Fahrenheit (27 degrees Celsius) and could keep it at about 13 degrees F (7 degrees C) ...