Park archeologists have found significant threats to culturally rich areas of the North Rim from the ongoing impacts of the House Rock bison herd on the Kaibab Plateau. Research shows that these bison follow migratory patterns in search of water and resources. In doing so, the herds trample through archeological sites causing damage to artifacts and cultural features found on the surface and buried underground. This is apparent in the wallows and bison trails surrounding and within survey sites.