A Yellow-rumped Warbler has been
wintering at our feeders in Toronto since
16 December 2012. It survived the coldest part of the winter with
temperatures as low as minus 21 Celsius. This young male
Yellow-rumped is now molting into its first breeding plumage. We
noticed signs of molt about two weeks ago. Compare the "Myrtle"
above photographed 31 March 2013 with the same bird in February in
the link below.