John Conlin-Hulme: Britain Year List 2021 BOU, All records: Top Blockers Record(s) 1 to 143 of 143 total. Seq. Species Scientific Name Seen By Other Listers Other Listers (%) 1 Brent Goose Branta bernicla 359 76.55 2 Canada Goose Branta canadensis 460 98.08 3 Greylag Goose Anser anser 449 95.74 4 Pink-footed Goose Anser brachyrhynchus 357 76.12 5 Mute Swan Cygnus olor 461 98.29 6 Shelduck Tadorna tadorna 441 94.03 7 Mandarin Duck Aix galericulata 310 66.10 8 Garganey Spatula querquedula 282 60.13 9 Shoveler Spatula clypeata 444 94.67 10 Gadwall Mareca strepera 442 94.24 11 Wigeon Mareca penelope 442 94.24 12 Mallard Anas platyrhynchos 461 98.29 13 Teal Anas crecca 445 94.88 14 Pochard Aythya ferina 426 90.83 15 Tufted Duck Aythya fuligula 457 97.44 16 Eider Somateria mollissima 333 71.00 17 Goldeneye Bucephala clangula 383 81.66 18 Goosander Mergus merganser 390 83.16 19 Red-breasted Merganser Mergus serrator 324 69.08 20 Red Grouse Lagopus lagopus 209 44.56 21 Grey Partridge Perdix perdix 294 62.69 22 Pheasant Phasianus colchicus 454 96.80 23 Red-legged Partridge Alectoris rufa 400 85.29 24 Swift Apus apus 430 91.68 25 Cuckoo Cuculus canorus 382 81.45 26 Rock Dove (Feral Pigeon) Columba livia 403 85.93 27 Stock Dove Columba oenas 416 88.70 28 Woodpigeon Columba palumbus 463 98.72 29 Collared Dove Streptopelia decaocto 453 96.59 30 Water Rail Rallus aquaticus 353 75.27 31 Moorhen Gallinula chloropus 458 97.65 32 Coot Fulica atra 456 97.23 33 Little Grebe Tachybaptus ruficollis 443 94.46 34 Great Crested Grebe Podiceps cristatus 447 95.31 35 Black-necked Grebe Podiceps nigricollis 255 54.37 36 Oystercatcher Haematopus ostralegus 448 95.52 37 Avocet Recurvirostra avosetta 394 84.01 38 Golden Plover Pluvialis apricaria 389 82.94 39 Lapwing Vanellus vanellus 453 96.59 40 White-tailed Plover Vanellus leucurus 200 42.64 41 Curlew Numenius arquata 436 92.96 42 Bar-tailed Godwit Limosa lapponica 368 78.46 43 Black-tailed Godwit Limosa limosa 411 87.63 44 Snipe Gallinago gallinago 413 88.06 45 Common Sandpiper Actitis hypoleucos 397 84.65 46 Green Sandpiper Tringa ochropus 351 74.84 47 Redshank Tringa totanus 434 92.54 48 Spotted Redshank Tringa erythropus 331 70.58 49 Greenshank Tringa nebularia 382 81.45 50 Turnstone Arenaria interpres 411 87.63 51 Knot Calidris canutus 349 74.41 52 Ruff Calidris pugnax 369 78.68 53 Sanderling Calidris alba 369 78.68 54 Dunlin Calidris alpina 418 89.13 55 Arctic Tern Sterna paradisaea 290 61.83 56 Common Tern Sterna hirundo 407 86.78 57 Sandwich Tern Thalasseus sandvicensis 372 79.32 58 Kittiwake Rissa tridactyla 382 81.45 59 Black-headed Gull Chroicocephalus ridibundus 460 98.08 60 Common Gull Larus canus 418 89.13 61 Herring Gull Larus argentatus 457 97.44 62 Great Black-backed Gull Larus marinus 433 92.32 63 Lesser Black-backed Gull Larus fuscus 448 95.52 64 Black-throated Diver Gavia arctica 178 37.95 65 Black-browed Albatross Thalassarche melanophris 200 42.64 66 Fulmar Fulmarus glacialis 389 82.94 67 Sooty Shearwater Ardenna grisea 126 26.87 68 Gannet Morus bassanus 405 86.35 69 Cormorant Phalacrocorax carbo 457 97.44 70 Shag Gulosus aristotelis 370 78.89 71 Spoonbill Platalea leucorodia 335 71.43 72 Bittern Botaurus stellaris 294 62.69 73 Little Egret Egretta garzetta 444 94.67 74 Cattle Egret Bubulcus ibis 300 63.97 75 Great White Egret Ardea alba 387 82.52 76 Grey Heron Ardea cinerea 454 96.80 77 Sparrowhawk Accipiter nisus 443 94.46 78 Marsh Harrier Circus aeruginosus 406 86.57 79 Red Kite Milvus milvus 434 92.54 80 Buzzard Buteo buteo 457 97.44 81 Short-eared Owl Asio flammeus 262 55.86 82 Tawny Owl Strix aluco 364 77.61 83 Kingfisher Alcedo atthis 410 87.42 84 Great Spotted Woodpecker Dendrocopos major 443 94.46 85 Green Woodpecker Picus viridis 395 84.22 86 Kestrel Falco tinnunculus 453 96.59 87 Merlin Falco columbarius 275 58.64 88 Peregrine Falco peregrinus 421 89.77 89 Ring-necked Parakeet Psittacula krameri 290 61.83 90 Jay Garrulus glandarius 447 95.31 91 Magpie Pica pica 460 98.08 92 Jackdaw Coloeus monedula 459 97.87 93 Rook Corvus frugilegus 453 96.59 94 Carrion Crow Corvus corone 460 98.08 95 Raven Corvus corax 415 88.49 96 Coal Tit Periparus ater 446 95.10 97 Willow Tit Poecile montanus 179 38.17 98 Blue Tit Cyanistes caeruleus 463 98.72 99 Great Tit Parus major 461 98.29 100 Bearded Tit Panurus biarmicus 299 63.75 101 Skylark Alauda arvensis 440 93.82 102 Sand Martin Riparia riparia 426 90.83 103 Swallow Hirundo rustica 437 93.18 104 House Martin Delichon urbicum 432 92.11 105 Cetti's Warbler Cettia cetti 387 82.52 106 Long-tailed Tit Aegithalos caudatus 453 96.59 107 Willow Warbler Phylloscopus trochilus 415 88.49 108 Chiffchaff Phylloscopus collybita 441 94.03 109 Sedge Warbler Acrocephalus schoenobaenus 413 88.06 110 Reed Warbler Acrocephalus scirpaceus 399 85.07 111 Blackcap Sylvia atricapilla 437 93.18 112 Garden Warbler Sylvia borin 343 73.13 113 Whitethroat Curruca communis 421 89.77 114 Goldcrest Regulus regulus 427 91.04 115 Wren Troglodytes troglodytes 458 97.65 116 Nuthatch Sitta europaea 431 91.90 117 Treecreeper Certhia familiaris 420 89.55 118 Starling Sturnus vulgaris 458 97.65 119 Song Thrush Turdus philomelos 454 96.80 120 Mistle Thrush Turdus viscivorus 437 93.18 121 Redwing Turdus iliacus 443 94.46 122 Blackbird Turdus merula 462 98.51 123 Fieldfare Turdus pilaris 422 89.98 124 Robin Erithacus rubecula 462 98.51 125 Stonechat Saxicola rubicola 432 92.11 126 Wheatear Oenanthe oenanthe 409 87.21 127 Dipper Cinclus cinclus 289 61.62 128 Tree Sparrow Passer montanus 328 69.94 129 House Sparrow Passer domesticus 458 97.65 130 Dunnock Prunella modularis 462 98.51 131 Yellow Wagtail Motacilla flava 368 78.46 132 Grey Wagtail Motacilla cinerea 440 93.82 133 Pied Wagtail Motacilla alba 460 98.08 134 Meadow Pipit Anthus pratensis 434 92.54 135 Tree Pipit Anthus trivialis 307 65.46 136 Water Pipit Anthus spinoletta 155 33.05 137 Chaffinch Fringilla coelebs 457 97.44 138 Bullfinch Pyrrhula pyrrhula 429 91.47 139 Greenfinch Chloris chloris 453 96.59 140 Linnet Linaria cannabina 437 93.18 141 Goldfinch Carduelis carduelis 454 96.80 142 Yellowhammer Emberiza citrinella 407 86.78 143 Reed Bunting Emberiza schoeniclus 439 93.60