A human conversation that doesn’t happen:
“Brrrrr, I’m freezing out here!”
“Remember, you can turn your body’s temperature requirements down—then you’ll be fine.”
“Oh, right, good idea. I forgot how easy it is to re-set my internal dial.”
A bird adaptation that does happen:
In cold weather, birds sometimes turn their internal heat requirements down—in Pennsylvania, mourning doves and turkey vultures regularly use that trick. The dialed-down state is called torpor. Torpor occurs when birds automatically slow their heart rates and breathing so they’ll require less energy to keep their bodies going. This really helps when the weather is challenging and food supplies are limited.