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Wilson's Warbler, Nick Saunders
Photo © Nick Saunders

Photo: Nick Saunders
Breeding evidence - Wilson's Warbler
Breeding evidence
Relative abundance - Wilson's Warbler
Relative abundance
Probability of observation - Wilson's Warbler
Probability of observation

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Wilson's Warbler
Cardellina pusilla

Click on plot to view table of mean abundance
Conserv. status:
SRank S5B
Number of squares
ConfirmedProbablePossiblePoint counts
0 10 202 428
Long-term BBS trends
RegionYearsTrend (conf. interv.) Reliab.
Saskatchewan1970 - 2022 1.14 (-2.06 - 4.95)Low
Canada1970 - 2022 -0.605 (-1.5 - 0.307)Medium

Mean abundance (number of birds detected per 5 min. point count) and percentage of squares occupied by region

Bird Conservation Regions [abund. plot] [%squares plot]
Arctic Plains and MountainsBoreal Hardwood TransitionBoreal Softwood Shield
Abund.%SquaresAbund.%SquaresAbund.%Squares
      0.030%
Boreal Taiga PlainsPrairie PotholesTaiga Shield and Hudson Plains
Abund.%SquaresAbund.%SquaresAbund.%Squares
0.011% 0.00% 0.040%

Atlas Results

Atlas results coming soon

Excerpts Adapted from the Birds of Saskatchewan:

At 11 cm in length, Wilson's Warbler is Saskatchewan's smallest regularly occurring warbler. "The combination of black beady eye, the brightness of the yellow, and the sheer exuberance of the bird help identify this little warbler in any plumage? (Roy 1996). Its breeding range is enormous and includes most of the boreal forest and the forest of the western mountains; its wintering range extends from the Gulf coast south through Mexico to Panama.

Willow, alder and birch thickets bordering muskegs and watercourses are its summer haunts (Smith 1996), where it stays close to the ground but often catches insects on the wing. The highest recorded density is 24 territories/100 ha in a willow fen in the Fort-à-la-Corne Provincial Forest (Smith 2008b). During migration, it frequents shelterbelts and other areas of trees and shrubs.

Wilson's Warbler is fairly common in its breeding range, which extends from the Northwest Territories south halfway into the northwestern portion of the mixedwood forest and throughout the Manitoba Lowlands (Smith 1996). South of the breeding range it is a common transient.

Original text by Joan Feather. Text adapted by Daniel J. Sawatzky

Read more about the Wilson's Warbler in the Birds of Saskatchewan here.

LeeAnn M. Latremouille

Recommended citation: Latremouille, L. M. 2025. Wilson's Warbler in Latremouille, L. M., S. L. Van Wilgenburg, C. B. Jardine, D. Lepage, A. R. Couturier, D. Evans, D. Iles, and K. L. Drake (eds.). 2025. The Atlas of the Breeding Birds of Saskatchewan, 2017-2021. Birds Canada. Saskatoon, Saskatchewan https://sk.birdatlas.ca/accounts/speciesaccount.jsp?sp=WIWA&lang=en [09 Nov 2025]

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