‘Snot a bad idea!
So, echidnas have a tiny little mouth, a long, sticky tongue—no teeth—and a long, pointy snout with the nostrils right at the tip. And the tip has electroreceptors. When ants and termites are moving around in the soil, echidnas can detect those electrical currents. That’s how they find their prey.
When those bubbles burst over the beak tip, it’s a way of dumping heat. They might be primitive mammals, but they’re mammals, and they produce heat through their metabolism; they have to lose that heat or they would get too hot. Well, we don’t have that big blood sinus in our nose, so it doesn’t work as well. But running your wrist under water is a really good trick! That works because we’ve got lots of blood vessels close to the surface in our wrist.If you don’t have an external source of water, you can use nasal mucus, you can use saliva, you can use urine. Kangaroos lick their forearms. Vultures and storks urinate on their legs.
There are other mammals that sweat, so we’re not really special. But we are really good at it. We’re one of the most efficient sweaters.
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