ScoreU - Unknown
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment357,617 square kilometers based on Natural Heritage Program range maps that appear on the Montana Field Guide
Area of Occupancy
ScoreU - Unknown
ScoreE - Relatively Stable (±25% change)
CommentSince species is a habitat generalist that can reproduce in any area with at least some nesting habitat, their habitats have likely been stable (i.e. +/- 25%) since European arrival.
ScoreD - Declining. Decline of 10-30% in population, range, area occupied, and/or number or condition of occurrences
CommentBBS has high credibility in Montana and shows an insignificant decline of -1.1% per year or 10% decline per decade. In surrounding states and provinces trends are both positive and negative.
CommentSeverity, Scope, and immediacy of threats in Montana are unknown, despite rangewide declines.
SeverityUnknown - Unknown
ScopeUnknown - Unknown
ImmediacyUnknown - Unknown
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).
ScoreD - Broad. Generalist. Broad-scale or diverse (general) habitat(s) or abiotic and/or biotic factors are used or required by the species, with all key requirements common in the generalized range of the species in the area of interest. If the preferred food(s) or breeding/nonbreeding microhabitat(s) become unavailable, the species switches to an alternative with no resulting decline in numbers of individuals or number of breeding attempts.
CommentSpecies uses a wide variety of habitats near areas with at least some nest trees.