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I remember being told as a child that dogs stick their tongue out to stay cool, because they can't sweat like us. This made sense to me.

But only a couple of days ago I suddenly thought: What about all the other animals?! I mean, I don't see a cat or a horse putting their tongues out, and yet I don't see them sweating either. How do they lose heat? How do different kinds of animals lose heat?

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There are a number of ways, which are briefly summarized here. I also recommend reading this nice Scitable article on thermoregulation. It is not too technical. Felines do pant when they get hot. Horses do sweat. Jackrabbits can enlarge the blood vessels in their large ears to eliminate excess heat. Bird use a process called gular flapping, which is similar to panting of dogs and cats. Animals can move into shaded areas. The possible mechanisms are many.

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