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Pretty much for the same reasons as us - it's simply nature.

Dinosaurs also had a four-chambered heart.

Unlike mammals, crocodile's right ventricle pumps blood throughout the body.

Such a heart perfectly separates blood going to the lungs from that going to the body, which is a requirement for the high blood flow rates and high metabolic rates characteristic of warm-bloodedness. However, living crocodiles are cold-blooded, so it didn't make sense for them to have a warmblooded heart - a mystery!

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13y ago

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