1. (Science: zoology) A common large North American marmot (Arctomys monax). It is usually reddish brown, more or less grizzled with gray. It makes extensive burrows, and is often injurious to growing crops.
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It depends on where you are. Where I am, they're called woodchucks; elsewhere, they're called marmots and groundhogs. http://mdc.mo.gov/nathis/mammals/woodchuck/
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