How many grey wolves live in Yellowstone?

At the end of 2011, at least 98 wolves in 10 packs plus 2 loners occupied Yellowstone National Park. The population size (97 wolves) and number of breeding pairs (8) is the same as at the end of 2010.

This is merely the wolf population that exists in the park. There are a number more which have already moved out of thepark to take up territory in the surrounding area