Bison Population estimated to be 3900
Yellowstone National Park – Summer 2010 Bison Population Estimate Released.
U.S. National Park Service Press Release
Yellowstone National Park – Summer 2010 Bison Population Estimate Released
August 18, 2010 — Ken Cole4 Responses to “Yellowstone National Park – Summer 2010 Bison Population Estimate Released”
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The Wildlife News 
August 19, 2010 at 4:32 PM
In a “typical year” what % of the total bison population will spend the entire year in YNP? (I understand that weather will greatly influnce the answer to this question).
August 23, 2010 at 4:23 PM
Have wolves since their reintroduction in 1995 had any impact on bison herds? I assume not as a much as their impact on elk herds, since bison are obviously more of a challenge to bring down.
August 23, 2010 at 5:56 PM
Ken: This link appears to be broken.
August 25, 2010 at 10:28 AM
Fixed it.