Woodchuck is a common name for three species of rodents in the Sciuridae family, which includes groundhogs, marmots, and wejacks. Groundhogs, also known as woodchucks, are large ground squirrels native to North America and have a body length of up to 20 inches. Marmots are large, stout-bodied ground squirrels found in mountainous areas of North America, Europe, and Asia, and have a body length of up to 24 inches. Wejacks are small, burrowing rodents found in North America and have a body length of up to 8 inches. All three species are known for their digging abilities and are commonly referred to as 'woodchucks'.