My Bone

I've been carrying a piece of leg bone around in my car ever since I found it at the Sherburne National Wildlife Refuge back in May. My friend and I figured it might belong to a sand hill crane. We had just been observing some sand hill cranes when we came upon the bone and the bone was entirely hollow, hence our thought it could be a sand hill crane leg bone. I showed it to a naturalist friend of mine. He said it was too heavy to be a bird bone. He said all bones are hollow. He suspected it was the knee bone of either a year old white tail deer or possibly a coyote.