Sightings:
- Little Gull (1st cycle). Keweenaw County, Michigan. 01 May 2021.
- California Gull (adult). Johnson County, Iowa. 02 May 2021.
- Thayer's Gull (1st cycle). Lewis and Clark County, Montana. 03 May 2021.
- Lesser Black-backed Gull (2nd cycle). San Francisco County, California. 05 May 2021.
- Lesser Black-backed Gull (3rd cycle). Grays Harbor County, Washington. 06 May 2021.
- Kumlien's Gull (1st cycle). Cook County, Illinois. 08 May 2021.
- Franklin's Gull (adult). Norfolk County, Ontario. 08 May 2021.
- Lesser Black-backed Gull (adult type). Central Kootenay District, B.C. 08 May 2021.
- Little Gull (1st cycle). Warren County, Ohio. 10 May 2021.
- Slaty-backed Gull (2nd cycle). Alameda County, California. 11 May 2021.
- Franklin's Gull (3; 10 adults). Lincoln County, Oregon. 11 May 2021.
- Likely a high count for coastal Oregon.
- Glaucous Gull (1st cycle). Marin County, California. 11 May 2021.
- Kumlien's Gull (1st cycle). Bucks County, Pennsylvania. 11 May 2021.
- Heermann's Gull (3rd cycle). Virginia Beach County, Virginia. 11 May 2021.*
- 2nd State Record. P1 dropped and thus the 3rd prebasic molt has commenced.
- Laughing Gull (adult). Valdez-Cordova County, Alaska. 12 May 2021.
- Apparent 7th State Record.
- Little Gull (1st cycle). Santa Cruz County, California. 13 May 2021.
- Black-legged Kittiwake (1st cycle). Durham County, Ontario. 13 May 2021.
- Franklin's Gull (1st cycle). Dare County, North Carolina. 15 May 2021.
- Ivory Gull (adult). Nome County, Alaska. 20 May 2021.
- Little Gull (adult). Kings County, California. 22 May 2021.
- Black-headed Gull (adult). Nome County, Alaska. 24 May 2021.
- Franklin's Gull (adult). Anchorage County, Alaska. 25 May 2021.
- Heermann's Gull (3rd cycle). Bristol County, Massachusetts. 27 May 2021.
- 1ST STATE RECORD. 3rd generation p1 growing in, p2-p3 dropped.
- Heermann's Gull (3rd cycle). Newport County, Rhode Island. 27 May 2021.
- 1ST STATE RECORD. Same individual from VA & MA.
- Thayer's Gull (1st cycle). San Diego County, California. 28 May 2021.
- Franklin's Gull (adult). Skagway-Hoonah-Angoon County, Alaska. 29 May 2021.
- 1st for Gustavus, Alaska.
- Ivory Gull (2nd cycle). Nome County, Alaska. 29 May 2021.
- Herrmann's Gull (3rd cycle). Cape May County, New Jersey. 30 May 2021.
- 1ST STATE RECORD. Same individual from VA, MA, RI.
- 3rd generation p1 growing in, p2-p3 dropped.
- Black-headed Gull (2nd cycle). Cape May County, New Jersey. 30 May 2021.
- Continuing.
Notes:
* The Heermann's Gull that excited several Northeast Atlantic states this month yielded three 1st state records (MA, RI, NJ) and a 2nd state record (VA) all within 20 days. It is believed this is the same Heermann's first found in Palm Beach County, Florida as a juvenile in August 2019. Age, molt and plumage patterns work out perfectly, as well as its sporadic wanderings. This bird also produced a 1st state record in Georgia back in February-March of 2021. It was last seen in Volusia County, Florida on 23 March 2021 before being spotted in Virginia Beach this month. It's obvious this bird has a faulty compass and is likely to turn up anywhere!