For those that don't know, these animals, deer, moose, etc etc.. When they grow in new antlers, they're covered in velvet, and after some time, the blood supply to the velvet gets shut off as the antlers calcify fully, and the velvet then sheds off. So they rub up on trees and what not to help get all of it off. Later on, the antlers themselves will shed, and then the process starts all over again. Cool video, such a powerful animal.
