They lived in caves, had fire, and wore animal skins as clothes.
Cave painting
whales keep warm by their blubber! good question
Large animals, like bison, horse, mammoth, etc.
The fur on their bodies keep them warm.
They don't need to keep warm, they have a double coat so they stay warm.
They urinate on their feet to keep warm.
The materials keep you warm by the fabric they are made out of!
heat keep us warm :)
they keep warm by sleeping in long grass.
what keep you warm in alska
Cave paintings and having body ornamentation
Cats have fur to keep them warm when they are cold.