The centuries-old bond between people and dogs has shaped canine evolution—from bark to adorable expressions.
found that dog puppies make more eye contact with humans than wolves, even when the wolf pups were reared by humans nearly from birth.
A wild gray wolf and a domesticated Bernese Mountain dog , highlighting some common facial differences between the wolf and domesticated dogs. Red arrows indicate the levator anguli occuli medialis muscle, a muscle not found in the gray wolf that supports eye gaze communication between dogs and humans.Humans mostly have fast-twitch muscles in their faces, but do have more slow-twitch muscles than chimpanzees’, likely in part to form sounds for speech, Burrows says.
The findings have led Burrows to suspect that humans may have favored wolves that had shorter staccato vocalizations during the process of dog domestication. Anthropologists have suggested that as humans domesticated dogs, they sought animals that could guard or warn them of any sudden threats. This alarm call—or bark—could have been important in the process of dog domestication. Now, “dogs just bark for a living,” Burrows says.
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