Who'd have thought?
Friends and enemies in the animal world tend to be pretty clear-cut — there are some species that weren't born to get along. But as these unlikely pairs show, even Mother Nature doesn't set things in stone: Who says that cats and birds can't all be friends? From a sheep that brought a baby elephant out of a deep depression to natural enemies that snuggle down together for every nap, these heart-wrenching relationships are unforgettable. (Text: Blythe Copeland)