Arctic National Wildlife Refuge -  Alaska

Antler Survey:  What can biologists learn from shed antlers?

Well, pregnant caribou maintain their antlers until they give birth. This means they drop their antlers in the same area where they drop their calves. Therefore, biologists can determine where on Arctic Refuge caribou historically calved and when – all by collecting and dating antlers. 

(via: U.S. Fish & Wildlife Service)

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