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Articles on Fossils

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A great hammerhead shark’s two eyes can be 3 feet apart on opposite sides of its skull. Ken Kiefer 2/Image Source via Getty Images

Why do hammerhead sharks have hammer-shaped heads?

The first hammerhead shark was likely the result of a genetic deformity. A biologist explains how shark DNA reveals hammerheads’ history.
Megalodon would have dwarfed today’s great white sharks. Christina Spence Morgan

Megalodon sharks ruled the oceans millions of years ago – new analyses of giant fossilized teeth are helping scientists unravel the mystery of their extinction

Megalodon, the world’s largest known shark species, swam the oceans long before humans existed. Its teeth are all that’s left, and they tell a story of an apex predator that vanished.
Tritylodon, a therapsid, reconstructed as a night dwelling warm blooded animal. Note the steam coming out of its lungs. Illustrated by Luzia Soares

Mystery solved: when mammals’ ancestors became warm-blooded

Warm-bloodedness is the key to what makes mammals what they are today. That’s why working out when it emerged in mammal ancestors matters.

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