Keratin is the tough protein that forms hair, nails and hooves. It’s also responsible for something far stranger: human horns.

Found on every horse, they appear as toughened growths on their limbs, and can be clipped back if they grow too large. Anyone following the charming and rugged farrier Sam Wolfenden on TikTok will ...

Thought to be extinct in the wild, the Spix Macaw currently exists in captivity with their numbers in the dismally low 60 to ...

An endangered loggerhead sea turtle has been released into the Atlantic Ocean from a Florida beach nearly three months after being hit by a boat.

Lambert, a critically endangered African penguin, has moved to a special geriatric island at the New England Aquarium in ...

Tiny, but feisty, chihuahuas are super energetic. Known as "purse dogs," they're between five and eight inches tall and weigh ...