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Wolf - Wikipedia
How many wild wolves are in the United States?
Wolf | Species & Facts | Britannica
Wolves - Facts, Diet & Habitat Information - Animal Corner
Wolf | National Geographic
Wolves 101 | Nat Geo Wild - YouTube
Gray wolf | Size, Habitat, Diet, Predators, & Facts | Britannica
Biology and Behavior - International Wolf Center
Gray Wolf - U.S. Fish and Wildlife Service
Wolves 101 - National Geographic Society