Teeth grew from the scales of primitive shark-like fish millions of years ago, research by scientists suggests. Old lineage cartilaginous fish like sharks, skates and rays that have skin which ...

The Devonian ancestors of fishes living today belonged to two main nonarmored groups. The cartilaginous fish, so-called because cartilage formed their skeletons, later gave rise to sharks and rays.

The difference between a shark and other fish: Unlike bony fish, sharks, rays, skates, and chimaeras are cartilaginous fish, meaning their skeletons are made of cartilage, not bone. Their skin is ...

Orcas know how to hunt and kill the world's largest fish, reveals new research - Orcas show off their terrifying intelligence ...