How Do I Identify Groundhog Burrows?

Groundhogs, also known as woodchucks, construct two different types of burrows: one for use in the summer and one for use in the winter. Summer burrows feature multiple openings that are about 10 to 12 inches in diameter and situated about 20 feet away from each other. Summer burrows are often more conspicuous than winter burrows, which have only one opening and are usually located in areas with dense cover.