Sails

Alternatively, consider ancient Mammal-like reptiles - Dimetrodon and many Edaphasaurids had sails on their backs formed from elongated neural arches. Do any extant species have this adaptation?

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... and cretaceous period the climate was quite cool this might mean the dinosaurs in the above periods might have been worm blooded.But still sails were present in ourangosaurs,spinosaurs,etc.This means they were cold blooded.Leaellynasaurus was probably warm blooded as it lived in antartica ...

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