The Associated Press YELLOWSTONE NATIONAL PARK, Wyo. (AP) — Standing at the edge of a bluff overlooking the Lamar River in Yellowstone National Park, TJ Ammond stared through binoculars at hundreds of buffalo dotting the verdant valley below. Tan-colored calves frolicked near their mothers while hulking bulls wallowed in mud. As his wife and young children clustered behind him, Ammond panned the vast herd and cried out: “I see a white one!” “Or no — that’s a pronghorn,” he soon corrected. “It’s white and it’s small.” Grizzly bears and wolves are usually the star attractions for wildlife watchers in Yellowstone but this spring, a tiny and exceedingly rare white buffalo calf has stolen the show. White buffalo — also known as bison — are held sacred by many Native Americans…