30 November 2017
Age/Molt stage: This appears to be a large 3 or 4-year, large white-headed gull. Given the black markings on the tail, we can be sure it's not a definitive adult. It appears the outer primary is still growing in, as are some inner secondaries, and so the prebasic molt hasn't concluded.
01 November 2017
- Western Gull (adult). Skeena-Queen Charlotte County, B.C. 03 October 2017.
- Lesser Black-backed Gull (4th cycle type). Pierce County, Washington. 05 October 2017.
- Sabine's Gull (juvenile). Brevard County, Florida. 07 October 2017.
- Mew Gull (adult). Laval, Québec. 10 October 2017.
- Lesser Black-backed Gull (adult type). Portage, Manitoba. 11 October 2017.
- California Gull (3rd cycle type). Arthabaska County, Quebec. 11 October 2017.
- Little Gull (adult). Kitsap County, Washington. 13 October 2017.
- Laughing Gull (1st cycle). Kiowa County, Colorado. 15 October 2017.
- Little Gull (adult type). Marion County, Iowa. 15 October 2017.
- Slaty-backed Gull (3rd cycle). Clallam County, Washington. 16 October 2017.
- Black-legged Kittiwake (adult). Lethbridge County, Alberta. 18 October 2017.
- Lesser Black-backed Gull (adult). San Diego County, California. 19 October 2017.
- Thayer's [Iceland] Gull (1st cycle). Seneca County, New York. 22 October 201
- The first weekend in October was prime time for Ross's Gulls at Point Barrow, with a high count of 450 reported on 08 October 2017.
- An apparent Glaucous x Great-blacked hybrid (juvenile) was photographed in Henry County, Tennessee on 07 October 2017. This may be the first record of this hybrid this deep into the interior continental United States. Still being seen up to 21 October.