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Fossils
Ah, yes. Dimetrodon. Not actually a dinosaur, despite what...some people may tell you. This REPTILE—not dinosaur—is most famous for the large sail-like organ on its back. Said organ was likely useful in regulating its—non-dinosaur—body temperature. Reptiles are known to be cold-blooded, but there is some debate as to whether dinosaurs were too. Dimetrodon assuredly was.
Data from Norviah/animal-crossing — MIT © Norviah — from the ACNH community data spreadsheet; images © Nintendo. Last updated .