Fossoriality, a life dedicated to living underground, has evolved several times in mammals. However, we know very little about burrowing, in large part because animals burrow in opaque substrates (soil and sand). In the Dumont lab, we study burrowing on moles. Moles are highly specialized diggers with specialized forelimb morphologies, including robust humeri, elongated scapulae and enlarged hands with six digits. In this project, we investigate how these derived morphologies increase the efficiency of burrowing in three North American moles.