to make themselves warm
what do u think
If that's what you're naming it, sure. Are they fluffy? Quite so, especially in the winter time.
hybernation
They have fluffy feathers to keep them warm from the coldness.
DBI
they hibernate
The purpose of mammals fur is to keep them warm through the winter
hibernate
No not really. It is great for hot weather, but in the winter it works best when layered and a sweater or coat.
Mamals dont go south for the winter so they need to have another layer of hair so they stay warm
yt
The image above is an Arctic fox in winter.