Hundreds of millions of years ago, fish had sensory features on their exoskeletons that contained dentine, the material that makes our teeth sensitive today ...

This unique footage shows what it's like to swim with hundreds of hammerhead sharks. The video shows the waters off the coast of Japan saturated with sharks. The amazing footage was taken by Lorien ...

Sharks, skates and catfish also have tooth-like structures called denticles that make their skin feel like sandpaper. When Haridy studied the tissues of her catfish, she saw that the denticles were ...