The undisturbed nature of the park makes it an ideal habitat for many species. Approximately two dozen different species of mammals can be seen at Bluestone National Scenic River. Common mammals include groundhog, raccoon, opossum, gray and fox squirrel, chipmunk, and white-tailed deer. Beaver, mink, and an occasional river otter may sometimes be seen along the river. Black bears and bobcats are reclusive and mostly nocturnal. Coyotes and red and gray foxes may also be seen here.