アメリカ自然史博物館のインスタグラム(amnh) - 6月21日 04時16分

Bootherium bombifrons may just win the #fossilfriday name game. An extinct relative of today's musk-oxen, this "ox beast" lived 20,000 years ago during the Pleistocene. The horns of musk-oxen have massive convergent bases used as a battering ram for defense and combat. #amnh #fossil #friday

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