Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Partners in Flight estimate the global population to number six million mature individuals (A. Panjabi in litt. 2017).
This species has undergone a decrease over the last 50 years in North America (23% decline between 1966 and 2015 based on the North American Breeding Bird Survey [Sauer et al. 2017], or 21% decline between 1970 and 2014 based on Partners in Flight [A. Panjabi in litt. 2017]). Recent trends, however, suggest a moderate, non-significant increase of 10.8% over the last three generations (Sauer et al. 2017).
Mountain Bluebird occurs in western and central USA, Mexico and Canada.
Text account compilers
Hermes, C., Ekstrom, J., Butchart, S.
BirdLife International (2020) Species factsheet: Sialia currucoides. Downloaded from http://www.birdlife.org on 04/07/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/07/2020.