Level I resources include species such as the Great Basin pocket mouse and Rocky Mountain elk. Level II resources include 115 species of plants, fish, and wildlife,86 of which are birds,and wildlife habitat areas in an early stage of vegetation change as a result of recent fires. Examples of Level III resources on Hanford include the sage sparrow and Columbia yellowcress, the largest population of which in Washington State occurs along the Hanford Reach. Level III habitat areas include wetlands, the Hanford Reach 100-year floodplain, and mature stands of shrub-steppe. As a federally designated Research Natural Area, the Fitzner/Eberhardt Arid Lands Ecology (ALE) Unit also is considered a Level III resource. Level IV, the highest and most restrictive level of management concern, applies only to rare pristine plant communities and habitats and to five species (two species of fish and three bird species), only two of which, the bald eagle and fall chinook salmon, are common." (BRMaP document)