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Wolf - Wikipedia
Wolf | Species & Facts | Britannica
Gray wolf | Size, Habitat, Diet, Predators, & Facts | Britannica
Wolves: Facts, Characteristics, Behavior, Diet, More
Wolves 101 | Nat Geo Wild - YouTube
Wolf | National Geographic
Gray Wolf - Pictures, Facts, and Map - National Geographic Kids
International Wolf Center
Gray Wolf - National Wildlife Federation
Wolves 101 - National Geographic Society