Lewis Mitchell: Britain Year List 2021 BOU, All records: Top Blockers Record(s) 1 to 71 of 71 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Canada Goose	Branta canadensis	460	98.08	
2	Greylag Goose	Anser anser	449	95.74	
3	Mute Swan	Cygnus olor	461	98.29	
4	Shelduck	Tadorna tadorna	441	94.03	
5	Shoveler	Spatula clypeata	444	94.67	
6	Gadwall	Mareca strepera	442	94.24	
7	Wigeon	Mareca penelope	442	94.24	
8	Mallard	Anas platyrhynchos	461	98.29	
9	Teal	Anas crecca	445	94.88	
10	Pochard	Aythya ferina	426	90.83	
11	Tufted Duck	Aythya fuligula	457	97.44	
12	Pheasant	Phasianus colchicus	454	96.80	
13	Rock Dove (Feral Pigeon)	Columba livia	403	85.93	
14	Woodpigeon	Columba palumbus	463	98.72	
15	Collared Dove	Streptopelia decaocto	453	96.59	
16	Moorhen	Gallinula chloropus	458	97.65	
17	Coot	Fulica atra	456	97.23	
18	Little Grebe	Tachybaptus ruficollis	443	94.46	
19	Great Crested Grebe	Podiceps cristatus	447	95.31	
20	Lapwing	Vanellus vanellus	453	96.59	
21	Bar-tailed Godwit	Limosa lapponica	368	78.46	
22	Black-tailed Godwit	Limosa limosa	411	87.63	
23	Snipe	Gallinago gallinago	413	88.06	
24	Redshank	Tringa totanus	434	92.54	
25	Turnstone	Arenaria interpres	411	87.63	
26	Black-headed Gull	Chroicocephalus ridibundus	460	98.08	
27	Common Gull	Larus canus	418	89.13	
28	Herring Gull	Larus argentatus	457	97.44	
29	Great Black-backed Gull	Larus marinus	433	92.32	
30	Cormorant	Phalacrocorax carbo	457	97.44	
31	Little Egret	Egretta garzetta	444	94.67	
32	Grey Heron	Ardea cinerea	454	96.80	
33	Sparrowhawk	Accipiter nisus	443	94.46	
34	Buzzard	Buteo buteo	457	97.44	
35	Great Spotted Woodpecker	Dendrocopos major	443	94.46	
36	Green Woodpecker	Picus viridis	395	84.22	
37	Kestrel	Falco tinnunculus	453	96.59	
38	Peregrine	Falco peregrinus	421	89.77	
39	Ring-necked Parakeet	Psittacula krameri	290	61.83	
40	Jay	Garrulus glandarius	447	95.31	
41	Magpie	Pica pica	460	98.08	
42	Jackdaw	Coloeus monedula	459	97.87	
43	Rook	Corvus frugilegus	453	96.59	
44	Carrion Crow	Corvus corone	460	98.08	
45	Coal Tit	Periparus ater	446	95.10	
46	Blue Tit	Cyanistes caeruleus	463	98.72	
47	Great Tit	Parus major	461	98.29	
48	Sand Martin	Riparia riparia	426	90.83	
49	Swallow	Hirundo rustica	437	93.18	
50	House Martin	Delichon urbicum	432	92.11	
51	Long-tailed Tit	Aegithalos caudatus	453	96.59	
52	Sedge Warbler	Acrocephalus schoenobaenus	413	88.06	
53	Blackcap	Sylvia atricapilla	437	93.18	
54	Lesser Whitethroat	Curruca curruca	332	70.79	
55	Goldcrest	Regulus regulus	427	91.04	
56	Wren	Troglodytes troglodytes	458	97.65	
57	Nuthatch	Sitta europaea	431	91.90	
58	Starling	Sturnus vulgaris	458	97.65	
59	Song Thrush	Turdus philomelos	454	96.80	
60	Blackbird	Turdus merula	462	98.51	
61	Robin	Erithacus rubecula	462	98.51	
62	Stonechat	Saxicola rubicola	432	92.11	
63	House Sparrow	Passer domesticus	458	97.65	
64	Dunnock	Prunella modularis	462	98.51	
65	Grey Wagtail	Motacilla cinerea	440	93.82	
66	Pied Wagtail	Motacilla alba	460	98.08	
67	Chaffinch	Fringilla coelebs	457	97.44	
68	Bullfinch	Pyrrhula pyrrhula	429	91.47	
69	Greenfinch	Chloris chloris	453	96.59	
70	Goldfinch	Carduelis carduelis	454	96.80	
71	Reed Bunting	Emberiza schoeniclus	439	93.60