Check the listing for details. Huge Bison Bison Radius Ulna & Thoracic Vertebra. Condition: Used. Listed at 29.00 USD. The thoracic vertebrae of a bison can be distinguished from other bovine species. So when I stumble on one in the river and I find individual bones that may not be able to identify between the species I can be confident that I am picking up bison. The thoracic vertebra is as distinguishable from a cow as its skull. The enormous radius and ulna are from a fully mature bison. Only the thoracic vertebra and radius/ulna are offered in this sale. The bones have been stabilized with professional grade Paraloid B72.