The small population of wolves on Isle Royale has been harmed by a lack of genetic diversity, plus the accidental introduction of canine parvovirus. In another part of the country, ecologists are also working to protect a larger population of wolves that live in a national park. Compared to the small, isolated population on Isle Royale, in the national park diseases like parvovirus are likely to be a problem, and lack of genetic diversity is likely to be a problem for the wolves.