From embryo to turtle cracker: Palaeobiologists studied the multiple changes in tooth shape in the tiger shark. The study is also central in drawing conclusions about extinct species from the myriad ...

Get unlimited access to ad-free articles and exclusive content. A collection of vicious weapons made of shark teeth reveals that two species of sharks vanished from the reefs of Kiribati before ...

A collection of vicious weapons made of shark teeth reveals that two species of sharks vanished from the reefs of Kiribati before scientists even noticed the species were there. Until about 130 years ...

Add Yahoo as a preferred source to see more of our stories on Google. As researchers continue to learn more about sharks that lurked in Kentucky seas hundreds of millions of years ago, two new species ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Megalodon, the ...

Editor’s note: Every year, hundreds of undergraduates at the University of Delaware pursue research under the guidance of a faculty mentor. Such experiences provided by UD — a nationally recognized ...

(Close-up of a shark with sharp teeth. Credit: GIOVANNI NITTI / Shutterstock.) Shark teeth are a marvel of evolution. They are so sharp that many island cultures once used them as weapons and tools to ...

Bill Eibner and Brea Wear were on a gravel (sand) bar searching for fossils and artifacts on the Cottonwood River just east ...