To keep warm and dry at the appropriate times, and to let the smoke from their fire leave. Tipis are also very portable, which was good, as most American aboriginals periodically moved to where the food was.
Nothing aside from attempt to protect their bit of turf on it , Aboriginals never saw them selves as being the owners of Australia in the first place.
whales keep warm by their blubber! good question
keep you warm
The fur on their bodies keep them warm.
They don't need to keep warm, they have a double coat so they stay warm.
what keep you warm in alska
Does a stikleback keep itself warm? that is the question.
heat keep us warm :)
The materials keep you warm by the fabric they are made out of!
They urinate on their feet to keep warm.
they keep warm by sleeping in long grass.