Thanks to its thick coat of fur, its tough hide, and a four inch layer of blubber, a polar bear is extremely well insulated.
Ever wonder how long your body could function without water? Find out on this Moment of Science.
Surprisingly, snow makes good insulation. In physics, an insulator is a material that does not conduct heat very well, like an oven mitt.
The large ones we see when a bird stretches its wings are “flight feathers,” but they also have fluffy ones called “down feathers.”