• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Population justification: The global population has been estimated at 300,000 mature individuals (Partners in Flight 2020). In North America (USA and Canada), the total population size is estimated at 290,000 mature individuals (Partners in Flight 2020). The species' population in North America (USA and Canada) is estimated to have a slightly negative trend, which equates to a small decline in population size over three generations (10 years) (Partners in Flight 2024). This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 10.2% within its mapped range over the past three generations (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). As North America holds the vast majority of the species' global range, the global population size is considered to be decreasing slowly over three generations.

Trend justification: This species has had stable population trends over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).

Recommended citation
BirdLife International (2024) Species factsheet: Williamson's Sapsucker Sphyrapicus thyroideus. Downloaded from https://datazone.birdlife.org/species/factsheet/williamsons-sapsucker-sphyrapicus-thyroideus on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.