Coyotes turn out to have face muscles that look capable of making that big-eyed, sad-puppy face that dogs have used to melt human hearts for eons. That discovery supports a rethink of humans’ history ...

Anybody who has ever been on the receiving end of a pair of puppy dog eyes knows they’re capable of melting hearts from miles away. And according to a new study, that’s no accident. Experts in the UK ...