Pine needles also insulate. Well you need to know that there are many insulators in this world. When you're in bed at night, you probably don't even think about whether your bedspread or blanket is an insulator. They are all insulators. Wisconsin, USA We use insulators to keep us warm.
Squirrels sleep in leaves in the winter.
Birds use sticks to build nests. People use styrofoam to insulate their houses. Straw is an insulator. If you jump into a haystack, it will warm you up. Dirt can keep animals warm.