Naked Mole Rats Unable to Feel Burning Pain

Naked mole rats, like most creatures, don’t like to be pinched or pricked—but just try to get one to yelp by rubbing lemon juice or red-hot chili peppers over a cut. It won’t.

That’s because the hairless, finger-size rats are numb to the burning sensation that almost every other mammal feels when exposed to acids and hot peppers.