You can use it for research or reference. To access the current information, please visit NatureCounts - The State of Canada’s Birds (external link).
The Breeding Bird Survey (BBS) is the most reliable source of data for population trends in the Mountain Bluebird, despite covering less than half the breeding population. While the BBS results show some annual fluctuations, the population is now about 25% less than it was in the early 1970s. This level of population change places the species' population on the border between the categories of what is considered a moderate decrease versus little change. At the regional level, populations have decreased in the Great Basin and Prairie Potholes Bird Conservation Regions while the Northern Rockies popultation has increased. The Mountain Bluebird population is considered to have shown little overall change relative to the early 1970s, though the reliability of this assessment is considered medium because the BBS does not cover a large portion of its range. The species is at an acceptable level relative to its national population goal (see Canada graph). The continental population has also remained relatively unchanged over the long-term.
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis
