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 ...
African wild dogs might use facial expressions to communicate with each other as they hunt in packs on the savanna. Arno Meintjes via Flickr under CC BY-NC-SA 2.0 DEED Puppy-dog eyes are irresistible.
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