Yes, they seem to be unusual. The only people I heard of doing similar is the Mongolians who stocked up for the winter too.
Explorer Frederick Cook wintered up there in even harsher conditions with some inuit claiming the Muskoxen was they only reason they survived. And I was going to draw comparison to the Clovis people but the article below beat me too it. Fascinating people you've introduced me too, must read up more.
This book Muskoxen and their hunters: a history By Peter C. Lent offers a theory on how they survived.

Uploaded with ImageShack.us
Hope it helps
Explorer Frederick Cook wintered up there in even harsher conditions with some inuit claiming the Muskoxen was they only reason they survived. And I was going to draw comparison to the Clovis people but the article below beat me too it. Fascinating people you've introduced me too, must read up more.
This book Muskoxen and their hunters: a history By Peter C. Lent offers a theory on how they survived.

Uploaded with ImageShack.us
Hope it helps