Justification of Red List Category
This species has a very 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 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.
Analyses of trend data from the North American Breeding Bird Survey suggest a 24% decline between 1966 and 2013 (Sauer et al. 2014). However, analyses of the trend between 2003 and 2013 shows only a non-significant decline of 0.2% per year during that time period (Sauer et al. 2014).
Text account compilers
Butchart, S., Ekstrom, J. & Westrip, J.
BirdLife International (2017) Species factsheet: Sitta pusilla. Downloaded from http://www.birdlife.org on 18/12/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/12/2017.