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Wolf - Wikipedia
Gray wolf | Size, Habitat, Diet, Predators, & Facts | Britannica
Gray Wolf - U.S. Fish and Wildlife Service
Gray wolf - National Geographic
Gray Wolf - Pictures, Facts, and Map - National Geographic Kids
Gray wolf | Smithsonian's National Zoo and Conservation Biology Institute
Gray Wolf - National Wildlife Federation
Gray Wolf - Yellowstone National Park (U.S. National Park Service)
Canis lupus (gray wolf) - ADW
Gray Wolf | Nature - PBS