Have you ever wondered why crocodiles stay still with their mouths open while basking in the sun? The reason they do this is not to wait for prey to come into their mouths willingly. They lie still like this mainly to conserve energy, which involves basking in the sun. You see, Crocodiles are cold-blooded animals and cannot maintain their body temperature through metabolism alone. Their mouths contain numerous blood vessels, and opening their mouths helps increase their body temperature more quickly.
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