|3rd cycle Thayer's/Kumlien's type. Winthrop Harbor, IL; 23 FEB 2011.|
|The mirror on P10 supports 3rd cycle. Bill size is also a plus for Thayer's.|
Here are two more flight shots of this Thayer's Gull:
If you haven't been exposed to Thayer's and/or Kumlien's on Lake Michigan, then be cautious when identifying these two. We have, in my opinion, the highest rate of intergrades anywhere in the lower 48 states. I continue to encounter more and more individuals that I don't feel comfortable assigning to either taxon. I'm sure my inexperience is partially to blame, but even some of Illinois' greatest birders are regularly humbled by problematic Thayer's/Kumlien's intergrades that don't seem to show textbook marks.
Anywho, I was glad to get several other Thayer's and Kumlien's (at a distance) on this day. I also enjoyed this 1st cycle Glaucous Gull that spent a good amount of time coming in for chum:
|1st cycle Glaucous Gull. North Point Marina; 22 FEB 2011.|