Happy Groundhog Day! Groundhogs have short ears and a short tail, and can weigh up to 11 pounds. They have two layers of fur: A dense grey undercoat and a longer coat of banded guard hairs that gives the groundhog a “frosted” appearance. Despite how they look, groundhogs are good swimmers and tree climbers. Photo of a groundhog eating a flower at Shenandoah National Park by National Park Service.