Marmots are large rodents that often become nuisances to gardeners, farmers, and homeowners due to their appetites and burrowing habits. The yellow-bellied marmot is the most common species in the United States and a close relative of the woodchuck. Also known as rockchucks or whistle pigs, yellow-bellied marmots are social creatures that live in communities of 10 to 20 individuals.
During the spring and summer, the animals undergo a period of hyperphagia, a feeding frenzy designed to fatten the marmots so they can survive the coming winter. By huddling together in underground burrows lined with hay or grass, marmots hibernate for up to 200 days at a time, easily spending half of their 13 to 15 years of life asleep.