アメリカ自然史博物館のインスタグラム(amnh) - 3月24日 05時09分

This is a skeleton of a 30-million-year-old fossil dog, Archaeocyon (“ancient dog”). The earliest dogs, going back 40 million years in North America, were animals no larger than a Chihuahua or a common house cat today. ©AMNH/D.Finnin

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