Fox urine is used to repel rabbits, groundhogs, woodchucks, squirrels and chipmunks. Smaller mammals include groundhogs, red squirrels, eastern chipmunks, martens, and snowshoe hares. Hunting woodchucks, also known as groundhogs, is prohibited. The definitive varmints are ground burrowing animals such as groundhogs and prairie dogs. Mammals, including rabbits and groundhogs, also eat the plants. Other sassafras leaf browsers include groundhogs, marsh rabbits, and American black bears. Some mammals eat the foliage, flowers and stems, including sheep, groundhogs, and rabbits. Phlox species are also a popular food source for groundhogs, rabbits and deer. At least some attacks on adult marmots like groundhogs ("Marmota monax") are abortive. Crew members sometimes had a shotgun to shoot rabbits, groundhogs, or other game. Unlike the incisors of many other rodents, the incisors of groundhogs are white to ivory-white. Black bears, cougars, groundhogs, and wolves have all been spotted at Devil's Lake. Groundhogs hibernate longer in northern latitudes than southern latitudes. It may use the dens of groundhogs as a temporary home or during heavy snow. The hunting of groundhogs is prohibited.