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1 September 2002 Re-evaluating the Bay-breasted Warbler Breeding Range: Nine Years of Presence in Lower Michigan
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Abstract

The breeding range of the Bay-breasted Warbler (Dendroica castanea) is thought to include only the northernmost portions of six northeastern and northcentral states in the United States. During a 10-year banding study of Kirtland's Warblers (Dendroica kirtlandii) in northern Lower Michigan, we caught 44 Bay-breasted Warblers outside of their reported migration dates during 9 of the 10 years. Two birds captured in 1997 were in breeding condition; one possessed a cloacal protuberance and the other a full brood patch. We also captured two hatching year birds with fleshy rictal flanges in 1997. We suggest that these records indicate a long term presence of Bay-breasted Warblers on breeding grounds considerably farther south than previously recorded.

Kevin Ellison, Paul W. Sykes, and Carol I. Bocetti "Re-evaluating the Bay-breasted Warbler Breeding Range: Nine Years of Presence in Lower Michigan," The Wilson Bulletin 114(3), 415-416, (1 September 2002). https://doi.org/10.1676/0043-5643(2002)114[0415:RETBBW]2.0.CO;2
Received: 6 November 2001; Accepted: 1 August 2002; Published: 1 September 2002
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