29 April 2017
Age: Rounded primary tips, gray scapulars and plain upperwing coverts all point to a 2nd cycle type large white-headed gull.
Identification: The pattern on the outer primaries - a so-called venetian blind effect - suggest a white-winged gull. The contrasting dark-brown outer webs with light-brown inner webs on the 5 outer primaries are reminiscent of Iceland Gull. The bill has retained much black with a pinched-base look, something we often find in Thayer's, and that's what the April Quiz bird was identified as.
2nd cycle Thayer's Iceland Gull. Milwaukee, Wisconsin. February 2017.
01 April 2017
- Common Gull (adult). Rockingham County, New Hampshire. 01 March 2017.
- Laughing Gull (adult). Lorain County, Ohio. 02 March 2017.
- Pair-bonding behavior observed with adult Ring-billed all throughout the month.
- Slaty-backed Gull (adult). San Mateo County, California. 02 March 2017.
- Continuing from February.
- Yellow-legged Gull (adult). 03 March 2017.
- Presumed atlantis. Continuing.
- Ivory Gull (1st cycle). Essex County, Ontario. 03 March 2017.
- Found in Flint, Michigan a week later.
- Little Gull (1st cycle). Berrien County, Michigan. 03 March 2017.
- A single bird continued for several weeks - not associating with other small gulls.
- Ivory Gull (1st cycle). Flint Michigan. 09 March 2017.
- Seen everyday through 13 March 2017 and then found dead late that morning. The specimen was delivered to the University of Michigan (Ann Arbor).
- Black-legged Kittiwake (1st cycle). Berrien County, Michigan. 10 March 2017.
- Slaty-backed Gull (adult). Benton County, Washington. 12 March 2017.
- Slaty-backed Gull (adult). St. John's County, Newfoundland. 17 March 2017.
- Kamchatka Gull (adult). Fairfield County, Connecticut. 20 March 2017.
- Black-headed Gull (adult). Sangamon County, Illinois. 23 March 2017.
- First county record.
- Lesser Black-backed Gull (1st cycle). Monterey County, California. 24 March 2017.
- Originally found in January 2017 with complete juvenile plumage, this presumed Heuglin's Gull (L.f. heuglini), was later sighted at the same location with ~80% post-juvenile scapulars. Possible 1st record of this taxon in the lower 48 states.
- Great Black-backed Gull (1st cycle). Loveland County, Colorado. 26 March 2017.
- Common Gull (adult). Barnstable County, Massachusetts. 26 March 2017.
- Mew Gull (adult). Richmond County, New York. 29 March 2017.
- An adult type Laughing x Ring-billed hybrid was found in Lorain, Ohio on 06 March 2017. This while a pure adult Laughing Gull was hanging out in this same harbor with a large contingent of Ring-billed Gulls. This seems to now be an established phenomenon on the Great Lakes, where the occasional adult Laughing Gull is found with Ring-billeds, and shortly after, a putative hybrid is detected in the following year(s).
- An overdue proposal to lump Thayer's and Iceland Gull has been submitted to the AOS Classification Committee (Proposal Set 2017-C).