| Tuesday 17th August 2021 | ||
| The highlight of the day was the discovery of an Aquatic Warbler in Dorset at Lytchett Bay. Lingering rarities confirmed as still present were the Black-browed Albatross in East Yorkshire, Least Tern in County Dublin, Black-winged Pratincole on the Shetland Isles, Forster's Tern in County Louth, Black Stork and Pacific Golden Plover together in Lincolnshire, Long-billed Dowitchers in both Carmarthenshire and Cheshire, Bonaparte's Gulls in Kent and Shetland, Ferruginous Duck in Warwickshire, and around the Isles of Scilly Lesser Yellowlegs and two Wilson's Petrels. Scarcities included Spotted Crake (Dorset), Red-backed Shrike (Shetland), Temminck's Stint (West Sussex), two Glossy Ibises, and four Long-tailed Skuas. |
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| - Chris Batty, RBA | ||