スミソニアン博物館のインスタグラム(smithsonian) - 6月7日 05時53分

This is Dimetrodon grandis, which is NOT a dinosaur. It lived millions of years earlier and belongs to the synapsids, a group that also includes mammals.
The bony rods along its backbone probably supported a thin, fleshy sail. The sail’s function is still a mystery—perhaps it helped the animal control its body temperature, attract mates, or recognize others of its own kind.
🔎 Thanks for sharing your fossil guesses with us! We’ll share another mystery from our @smithsoniannmnh tomorrow. #DeepTime

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