Sunday, August 19, 2012

Canada Warbler

On Saturday I banded the first two Canada Warblers of the fall. (These photos were actually taken last year.) This species molts into prebasic plumage before fall migration begins. Thus, in contrast to many other fall warblers, Canada Warblers are often brightly colored. 
A lot of variation and overlap in color intensity, however, exist between both fall male and female, first-year and adult birds. Individuals with indistinct breast stripes are not necessarily females.
The species breeds in forests across central Canada and eastward to the northern Great Lakes states, New England, and the maritime provinces, then south through the Appalachian Mountains. Canada Warblers are usually not difficult to find as they migrate through southern Minnesota and nest in the northern forests of the state. Nevertheless, population numbers are declining about 2% a year (Reitsma et al. 2010). Forest clearing in both its breeding range and in the eastern Andes, which is the winter range, is likely a major reason for this decline.

1 comment:

  1. Snap, we both have the same bird this week. Mine is a young one that was being banded at the Prince Edward Point Bird Observatory in Ontario Canada ... the perfect place for a Canada Warbler :)