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Gray wolves were reintroduced into Yellowstone, a national park in the northwest United States, in 1995.
As of 1995, there were gray wolves living in Yellowstone, a national park in the northwest United States.
The carrying capacity of an environment, such as Yellowstone, describes the maximum number of species that the environment can sustain over time.
Yellowstone is a national park that has roughly 100 gray wolves living in it.