Columbia subject headings:
Animal behavior.
Rocky Mountains.
Yellowstone National Park.
Zoology--Rocky Mountains.
Zoology--Yellowstone National Park.
Harvard subject headings:
Animal behavior
Rocky Mountains.
Yellowstone National Park.
Zoology--Rocky Mountains.
Zoology--Yellowstone National Park.
Princeton subject headings:
Animal behavior.
Rocky Mountains.
Yellowstone National Park.
Zoology--Rocky Mountains.
Zoology--Yellowstone National Park.