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COSEWIC Assessment and Update Status Report on the Cerulean Warbler in Canada
- Assessment Summary
- Executive Summary
- COSEWIC Mandate, Membership and Definitions
- Lists of Figures and Tables
- Species Information
- Population Size and Trend
- Limiting Factors and Threats
- Special Significance of the Species
- Existing Protection or Other Status
- Summary of Status Report
- Technical Summary
- Acknowledgements, Literature Cited, and Biographical Summary of Contractors
- Authorities Consulted and Collections Examined
COSEWIC Status Report
The Cerulean Warbler is a small (8-10 g) wood-warbler with relatively long wings and a short tail. The adult male is deep blue above, white below, and has a blue-black band across the throat (Figure 1). The adult female is blue-green above, whitish below (often with yellow wash) and has a yellow-white eyebrow or supercilium. Both sexes have 2 prominent white wing-bars and white tail spots. Young individuals (second-year) tend to be similarly marked to adults but duller and less boldly marked. However, there is little consensus on what plumage colour characteristics best distinguish female age classes. For complete descriptions of plumage characteristics, refer to Dunn and Garrett (1997), Pyle (1997), and Hamel (2000a).
Photo courtesy of Jason Jones.
Confusion with other species is unlikely for the adults of either sex. Immature birds in their first fall can look superficially similar to young female Blackburnian Warblers (Dendroica fusca). However, young Cerulean Warblers tend to be yellow-white below while Blackburnian Warblers tend to be buffy. In addition, Blackburnian Warblers have pale streaking on the sides of the back that is not seen in Cerulean Warblers.
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