This photo of caribou on the autumn tundra while losing their antler velvet was taken on Canada's Far North. During the autumn period that begins in late August, the caribou bulls start to shed their antler velvet. During this period the antlers are tinged red from the shedding process, and is called 'hanging bloody'. By mid-September, just before the mating period, the antlers are usually velvet free and sun-bleached white again.