Chitons are constantly scraping their teeth on rocks to eat the algae off of them, but that means their teeth need to be pretty tough. And it turns out one species's teeth are the hardest, stiffest ...

National Geographic finds continued animal suffering and exploitation in these YouTube videos. Here's what's being done months after the platform pledged to take swift action. YouTube is rife with ...

Birds, unlike their dinosaur ancestors, lack teeth, relying on beaks and gizzards for eating. Some birds have evolved ...

Ancient collagen preserved in the bones of extinct Australian mammals is revealing their evolutionary relationships, leading to some surprises.