アメリカ自然史博物館のインスタグラム(amnh) - 8月9日 05時03分

This graceful little fossil is Ramoceros osborni, which lived 14.5 million years ago and is a relative of the living pronghorn antelope. This species is unique in that its horns have three branches and are asymmetrical - one is always longer than the other. #fossilfriday

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