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Researchers estimate that the megalodon boasted an overall average body temperature of about 27 degrees Celsius

Megalodon, perhaps the largest shark of all time, appeared about 23 million years ago, then disappeared about 3.6 million years ago amid declining ocean temperatures and sea levels.

Highlights from CNN, Forbes, Discover Magazine and others.

WASHINGTON: The megalodon, a huge shark that was the scourge of the ancient oceans and is a star in modern movie theatres, is named for its "large tooth" - and for good reason. Its serrated teeth - up to about 18cm - could tear through any prey in the deep blue sea. Those teeth now are providing a fuller u

Evidence is mounting that megalodon could have been warm-blooded, unlike most modern sharks, hinting at how it grew to be so big and also why it went extinct

The amount of energy the giant sharks needed to maintain their body temperature in cold waters may have led to their extinction.

The findings might help explain why the giant shark went extinct 3.6 million years ago.

The terrifying extinct shark was warm-blooded and could regulate its body temperature, report experts at the University of California, Los Angeles.

The findings might help explain why the giant shark went extinct 3.6 million years ago.

This evolutionary advantage may have also contributed to their eventual demise.