Allie Swafford on Instagram: "Wild scenes from Yellowstone as this Wolf Pack takes over a bison carcass when this Grizzly Bear had its fill. The Wapiti Lake Pack waited patiently for this large male Grizzly Bear to have his share of a bison. As soon as he left, it was party time for the Wolves. #wolf #wolfpack #wolves #grizzlybear #wolvesofyellowstone #haydenvalley #yellowstone #yellowstonenationalpark #wapitilakepack #wildlifephotography #nature"