| Friday 17th September 2021 | ||
| New discoveries today included an Isabelline Wheatear at Easington, Yorkshire, a Booted Warbler on Fetlar, Shetland, a Semipalmated Sandpiper at Boulmer and a Pacific Golden Plover on Holy Island, both Northumberland, a Baird's Sandpiper at Timoleague and another on Haulbowline, both County Cork, a Lesser Yellowlegs at Tacumshin, County Wexford and another at Lochmaddy, Western Isles, a Pallid Harrier at Toe Head, County Cork, a Wilson's Petrel off Newquay, Cornwall and a Lesser Scaup on North Ronaldsay, Orkney.
Lingering rarities included the White-tailed Lapwing in Yorkshire, Lesser Yellowlegs in Suffolk, Baird's Sandpipers in County Cork and Western Isles, Balearic Woodchat Shrike in Scilly, King Eider in Shetland and Bonaparte's Gull in Kent. Scarcity highlights included a Woodchat Shrike, a Red-backed Shrike, a Bluethroat, an Icterine Warbler, two Hoopoes, two Common Rosefinches, seven Wrynecks, seven Lapland Buntings, two Purple Herons, a Dotterel, an American Golden Plover, five Buff-breasted Sandpipers, 35 Pectoral Sandpipers, a Ring-necked Duck, a Honey Buzzard, four Glossy Ibises, a Glaucous Gull, four Long-tailed Skuas and six Pomarine Skuas. |
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| - Will Soar, RBA | ||