herd of bison grazing on a field with mountains and trees in the background

america americanbison animal bison bisonherd blue bluesky buffalo bull bullbison country countryside farm farming field glaciernationalparkmontana grass grazing green herd hornsbull landscape mammal montana mountains nationalpark nationalparks nature naturelandscape northdakota outdoor park pasture rural sky southdakota wild wildlife wildlifeanimals wildlifebackground yellowstone yellowstonenationalpark yellowstonepark