You step out of the minivan just before dawn and the world of Yellowstone exhales: a low mist rides the river, steam from distant hot springs hangs like smoke, and a guide lifts a spotting scope with practiced calm. The road ahead curves through the wide sweep of Lamar Valley — often called Yellowstone’s Serengeti for a reason — where pronghorn pick their way across sage and bison punctuate the plains like living markers. This is an 8‑hour circuit of the park’s upper loop, run from Gardiner, MT, built around patient watching, sharp optics, and the kind of local know‑how that turns chance sightings into reliable wildlife encounters.