アメリカ自然史博物館のインスタグラム(amnh) - 2月15日 01時54分
Who's your biggest fan this Valentine's Day? This early mammal relative! ❤️ The large fan-like "sail" on Dimetrodon's back may have been used for temperature regulation, to attract mates, or to frighten off other animals. Dimetrodon was one of the earliest relatives of mammals and is a member of a group called synapsids.
Image no. b10007763, © AMNH Library
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