Post-gardening and pre-Stanley Cup final-viewing, I was able to dig up a very informative little essay on Blue-winged x Golden-winged Hybrids in the Dunn & Garrett book on Warblers (Peterson Field Guide series). The Brewster's Warbler observed this morning east of Aurora was a male F2 backcross, best shown in the photo on pg. 141 of that book. There are several good plates on pg. 49, though the Brewster's 2nd generation backcross male shown there has two distinct wing bars, unlike the variant observed east of Aurora today.
My earlier post has more details and directions. Ron Fleming, Newmarket "Ronald J. Fleming" <[EMAIL PROTECTED]> Visit http://www.ofo.ca/ontbirdsguide.htm for information on leaving and joining the list. As well as general information and content guidelines.
