The gray wolf (Canis lupus) is the largest wild member of the family Canidae, with adults typically weighing between 40 and 175 pounds depending on sex and geographic range. Wolves are highly social animals that live in family-based packs, typically led by a breeding pair, and communicate through howling, scent marking, and body language across territories that can span hundreds of square miles. They are found across a broad range of habitats, including Arctic tundra, boreal forest, temperate woodland, grassland, and semi-arid steppe, with populations present across North America, Europe, and Asia.
As apex predators, gray wolves regulate prey populations, most notably ungulates such as elk, white-tailed deer, and moose, which in turn shapes vegetation structure and benefits a wide range of other species. The reintroduction of wolves to Yellowstone National Park in 1995 is one of the most studied examples of trophic cascade in modern ecology. Despite their Least Concern status on the IUCN Red List, many regional populations remain under significant pressure from habitat loss, human-wildlife conflict, retaliatory killing by livestock producers, and in some areas, legal hunting. Populations in parts of Western Europe and the contiguous United States are still recovering from near-total extirpation in the twentieth century.
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