Sightings:
- Heermann's Gull (2nd cycle). Chatham County, Georgia. 01 March 2021.
Black-legged Kittiwake (1st cycle). Chautauqua County, New York. 01 March 2021. - Slaty-backed Gull (3rd cycle). Halifax County, Nova Scotia. 01 March 2021.
- 3rd Province Record.
- Mew Gull (2nd cycle type). Washoe County, Nevada. 02 March 2021.
- California Gull (subadult). Virginia Beach County, Virginia. 03 March 2021.
- Mew Gull (1st cycle). Kings County, New York. 04 March 2021.
- Continuing from previous month.
- Slaty-backed Gull (3rd cycle). Kenai Peninsula Borough, Alaska.06 March 2021.
- Bonaparte's Gull (1st cycle). Kenai Peninsula Borough, Alaska. 06 March 2021.
- Laughing Gull (2nd cycle). Marin County, California. 02 March 2021.
- Ross's Gull (adult). Bethel County, Alaska. 09 March 2021.
- Heermann's Gull (2nd cycle). Volusia County, Florida. 09 March 2021.
- Glaucous Gull (1st cycle). Union County, New Jersey. 10 March 2021.
- Ivory Gull (40 individuals). Northern Peninsula-St. Anthony County, NL. 11 March 2021.
- Great Black-backed Gull (1st cycle). Canadian County, Oklahoma. 12 March 2021.
- Slaty-backed Gull (adult). Kodiak Island County, Alaska. 13 March 2021.
- Laughing Gull (adult). Barton County, Nebraska. 14 March 2021.
- California Gull (1st cycle). East Baton Rouge Parish, Louisiana. 14 March 2021.
- California Gull (adult). Dare County, North Carolina. 18 March 2021.
- Slaty-backed Gull (3rd cycle). Comox-Strathcona District, British Columbia. 18 March 2021.
- Little Gull (1st cycle & adult). Gibson County, Indiana. 20 March 2021.
- Great Black-backed Gull (adult). Larimer County, Colorado. 22 March 2021.
- Vega Gull (adult). Santa Clara County, California. 22 March 2021.
- Slaty-backed Gull (1st cycle). Comax, British Columbia. 22 March 2021.
- Great Black-backed Gull (1st cycle). Saskatoon County, Saskatchewan. 25 March 2021.
- Slaty-backed Gull (adult). Ashland County, Wisconsin. 26 March 2021.
- California Gull (adult). New Haven County, Connecticut. 27 March 2021.
Notes:
- Earlier this month, Chuck Slusarczyk Jr reported a banded Ring-billed Gull from Cleveland that he submitted to the Bird Banding Lab in January of 2021. The USGS BBL confirmed with him that this individual was banded as a flightless chick in Toronto on 18 June 1992, putting it at 28 years 9 months old. According to the BBL, this sets a new longevity record for the species (the previous being 27 years, 6 months). Band number: 0785-64995.