ALT Cats are believed to be the only mammals who don't taste sweetness. House cats share 95.6% of their genetic makeup with tigers. Cats walk with both right feet then both left feet. Camels and giraffes do too. Cats stick their bum in your face as a gesture of friendship. We think a cat wrote this fact. Cats can drink seawater as their kidneys are able to filter salt out of water. Cats knock objects over and off edges to test for prey. And we're pretty sure they like doing it just to annoy us too. People with cat allergies aren't allergic to fur, but to protein found in cats' saliva, urine and dander. A cat's purr has the power to self heal. The collective noun for a group of wild cats is a destruction. A cat's tongue can lick bones clean of any bits of meat.