NBC Newsのインスタグラム(nbcnews) - 6月19日 11時01分

New research suggests that over thousands of years of #dog domestication, people preferred pups that could pull off #puppy dog eyes. And that encouraged the development of the facial muscle that creates it.
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Today, pooches use the muscle to raise their eyebrows and make the babylike expression. That muscle is virtually absent in their ancestors, the wolves. Click the link in our bio for more.
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