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Gray wolves once ranged over much of North America. Populations were apparently highest in habitats with plentiful large prey, principally ungulates (Young and Goldman 1944). Large mammals account for a majority of the diet of the wolf, with deer, moose, bighorn sheep, and similar-sized species among the most frequent prey (Paradiso and Nowak 1982). When such game is scarce, it turns its attention to mice, ground squirrels and rabbits.
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