ScoreU - Unknown
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment380525 square kilometers based on Natural Heritage Program range maps
Area of Occupancy
ScoreH - >20,000 km squared (greater than 5,000,000 acres)
Comment80121 square kilometers based on GAP predicted model.
ScoreE - Relatively Stable (±25% change)
CommentDeciduous shrub habitats fairly stable over the last 200 years since European arrival.
ScoreE - Stable. Population, range, area occupied, and/or number or condition of occurrences unchanged or remaining within ±10% fluctuation
CommentBreeding Bird Survey (BBS) has moderate credibility in Montana and shows an increase of 0.6% per year since 1980 which is a 6 percent increase over a 10 year time period. Idaho and Wyoming data are moderate credibility with Idaho showing significant decrease and Wyoming a nonsignificant increase. Overall this seems to equate to stable.
ScoreF - Widespread, low-severity threat. Threat is of low severity but affects (or would affect) most or a significant portion of the population or area.
CommentLoss of shrub habitats due to habitat loss. Cowbirds and grazing.
SeverityLow - Low but nontrivial reduction of species population or reversible degradation or reduction of habitat in area affected, with recovery expected in 10-50 years.
CommentDeciduous shrubs could recover quickly and with cowbird removal birds could recover quickly
ScopeModerate - 20-60% of total population or area affected
CommentA high percentage of nests are being exposed to grazing and parasitism
ImmediacyModerate - Threat is likely to be operational within 2-5 years.
ScoreC - Not Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance; or species has high dispersal capability such that extirpated populations soon become reestablished through natural recolonization (unaided by humans).
ScoreC - Moderate. Generalist. Broad-scale or diverse (general) habitat(s) or other abiotic and/or biotic factors are used or required by the species but some key requirements are scarce in the generalized range of the species within the area of interest.
CommentUses a broad variety of deciduous shrub habitat.