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15 'Che status of extant populations of Preble's meadow jumping mouse is poorly known in Colorado, and unknown in Wyoming. Extant populations aze known from the Rocky Flats Environmental Site, the Fort St. Vrain Nuclear Generating Station, the Ciry of Boulder Open Space (Tracy Collins parcel and the Van Vleet pazcel) (Compton and 13ugie 1993). An intriguing repon of the species comes from neaz Woodburn, Fd Paso County, Colorado (Jones and Jones 1985), as cited in Compton and Hugie (1993). The exact location of Woodburn is unknown at this time (personal communication with David Armstrong 1994), and no recent live trapping effort has been conducted in this strea (Compton and Hugie 1993). "the first Preble's meadow jumping mouse recorded at the Rocky Flats Envirorunental 'technology Site was captured in 1991 (Ebasco Biologists 1992, U. S. Department of I?nergy 1994c). Intensive trapping efforts have been conducted since 1992 (U. S. Department of Energy 1994c, 1994a, personal communication with Kevin Essington x.994; EG&G 1993a, 1992). The population at RFETS has been under study for several years and is the best known population in the state (and in the world) (Fred 1-Iarrington -personal communication; David Armstrong -personal communication). "he Rock Creek population (or subpopulation) is the only known site containing <_ufficient numbers and habitat to be considered potentially viable. For this reason, the Flock Creek Site is considered by CNHP to be of high biodiversiry significance. The Natural Heritage Network ranks this subspecies as G5T1?/Sl? indicating that the _pecies (Zapus hudsonius) is globally common. The subspecies, noted by the Tl? rank, is extremely rare and imperilled globally. Finally, Preble's meadow jumping mouse is extremely rare in Colorado, indicated by the rank of S1? The "?" after the ranks indicate a certain level of uncertainty due to insufficient surveys over the potential range. In any case, it is the consensus of experts that this subspecies, even if more widespread, will always be considered rare (David Armstrong - personal communication). Other mammals known from the Rock Creek site aze not considered rare, threatened or endangered. The rare Memam's shrew CSorex memami) is known from [he Woman Creek drainage, but has not been verified from the Rock Creek drainage. fUthough several special concern bird species have been observed at the Rocky Flats E',nvironmental Technology Site, most carutot be considered occurrences of conservation significance. Tracked occurrences for bird species are only those with probable or confirmed breeding status, as per Colorado Bird Atlas guidelines (Kingery 1990), or significant concentration areas (migrating orwintering). Based on existing information, birds of special concern that probably breed within the Rock Creek Site include the loggerhead shrike (Lanius ludovicianus) and the black-crownednight-heron (T~+cticorax rt cticorax . ,. .... ~-...-r .. ...-..-~H- n