Autopsy of two Woodchuck Hepatitis Virus (WHV) infected Woodchucks, Marmota monax, revealed the presence of two parasites in an hepatic localization, Taenia mustelae (Larvae) and Calodium hepaticum. The authors present the identification of the two parasites, based on the observation of cysticerci of Taenia mustelae, or on the observation of the eggs of C.hepaticum. They discuss the probable interaction between hepatic parasites and WHV infection.