To date, park staff have been unable to locate the calf,” the National Park Service announced on its website Friday.

Park officials said the birth of a white bison calf in the wild is believed to occur in about one in a million births, or even less frequently. Jim Matheson, executive director of the National ...

YELLOWSTONE NATIONAL PARK, Wyo. — Yellowstone National Park on Friday confirmed the birth of a white bison calf at the park but said there have been no confirmed sightings of the calf since June 4.

YELLOWSTONE NATIONAL PARK, Wyo. — Yellowstone National Park on Friday confirmed the birth of a white bison calf at the park but said there have been no confirmed sightings of the calf since June 4.

YELLOWSTONE — The birth of a rare white bison made headlines a month ago, but it’s been nearly a month since the calf was last seen. Yellowstone National Park officials said they haven’t ...