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.