Whale sharks’ huge bodies mean they’ve never really been cold-blooded

“Cold-blooded” has always been something of a misnomer. It’s convenient shorthand for animals that don’t hold their body temperature higher than the environment. Reptiles, insects, and fish are cold-blooded. But like many things in biology, the truth is more complicated than animals running either hot or cold.

One of those exceptions, according to a new paper in the Journal of Experiment Biology, is the whale shark. These huge tropical fish stay toasty warm even when they dive into…

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