They would have discovered why dogs make the sad look sad

Researchers They dissected corpses of domestic dogs and wild wolves, in an article published Monday in the journal of the American Academy of Sciences (PNAS). So they corroborated that the first one had says two well-formed muscles, unlike the seconds. The two separated their paths of evolution about 33 thousand years ago.

They also filmed two-minute interactions between dogs and a person they did not know, then between wolves and a human. Only the first managed to move the eye contour with great intensity.

"It helped them widen their eyes, as babies do", he explained to AFP Anne Burrows, professor at Duquesne University of Pittsburgh and co-author of the study. "It provokes a protective reaction among the people," he added.

This work is in addition to similar work, including that carried out in 2015 by Japanese scientists who showed that the exchange of glances between dogs and their masters caused a mutual peak of oxytocin, called "hormone of love" . It's the same thing that happens when a mother and baby look at each other.