The famous and often controversial Yellowstone bison herds are changing the ecosystem around them as they move steadily to the west, according to Mary Meagher, a retired National Park Service biologist who has studied the bison for 40 years.
Bison Herd Changing Ecosystem
Bison Herd Changing Ecosystem
The famous and often controversial Yellowstone bison herds are changing the ecosystem around them as they move steadily to the west, according to Mary Meagher, a retired National Park Service biologist who has studied the bison for 40 years.