Add Yahoo as a preferred source to see more of our stories on Google. The characteristic hammer-shaped head is just becoming visible in this image of an embryonic bonnethead shark. Scale bar = 1 cm.

The first-ever look at hammerhead shark development shows how they develop their hammer in stunning detail. For weeks, you'd be hard pressed to tell if the rapidly growing animal was going to become a ...

A newly discovered prehistoric shark, Bavariscyllium, is rewriting our understanding of shark evolution. This fascinating creature, which roamed the seas about 150 million years ago during the ...