Mark Coleman: Britain Year List 2021 BOU, All records: Top Blockers Record(s) 1 to 79 of 79 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	Egyptian Goose	Alopochen aegyptiaca	370	78.89	
5	Shoveler	Spatula clypeata	444	94.67	
6	Gadwall	Mareca strepera	442	94.24	
7	Mallard	Anas platyrhynchos	461	98.29	
8	Teal	Anas crecca	445	94.88	
9	Red-crested Pochard	Netta rufina	170	36.25	
10	Pochard	Aythya ferina	426	90.83	
11	Tufted Duck	Aythya fuligula	457	97.44	
12	Pheasant	Phasianus colchicus	454	96.80	
13	Swift	Apus apus	430	91.68	
14	Cuckoo	Cuculus canorus	382	81.45	
15	Rock Dove (Feral Pigeon)	Columba livia	403	85.93	
16	Stock Dove	Columba oenas	416	88.70	
17	Woodpigeon	Columba palumbus	463	98.72	
18	Collared Dove	Streptopelia decaocto	453	96.59	
19	Moorhen	Gallinula chloropus	458	97.65	
20	Coot	Fulica atra	456	97.23	
21	Little Grebe	Tachybaptus ruficollis	443	94.46	
22	Great Crested Grebe	Podiceps cristatus	447	95.31	
23	Little Ringed Plover	Charadrius dubius	360	76.76	
24	Lapwing	Vanellus vanellus	453	96.59	
25	Common Sandpiper	Actitis hypoleucos	397	84.65	
26	Redshank	Tringa totanus	434	92.54	
27	Common Tern	Sterna hirundo	407	86.78	
28	Black-headed Gull	Chroicocephalus ridibundus	460	98.08	
29	Herring Gull	Larus argentatus	457	97.44	
30	Lesser Black-backed Gull	Larus fuscus	448	95.52	
31	Cormorant	Phalacrocorax carbo	457	97.44	
32	Little Egret	Egretta garzetta	444	94.67	
33	Grey Heron	Ardea cinerea	454	96.80	
34	Sparrowhawk	Accipiter nisus	443	94.46	
35	Red Kite	Milvus milvus	434	92.54	
36	Buzzard	Buteo buteo	457	97.44	
37	Barn Owl	Tyto alba	371	79.10	
38	Tawny Owl	Strix aluco	364	77.61	
39	Great Spotted Woodpecker	Dendrocopos major	443	94.46	
40	Green Woodpecker	Picus viridis	395	84.22	
41	Kestrel	Falco tinnunculus	453	96.59	
42	Ring-necked Parakeet	Psittacula krameri	290	61.83	
43	Jay	Garrulus glandarius	447	95.31	
44	Magpie	Pica pica	460	98.08	
45	Jackdaw	Coloeus monedula	459	97.87	
46	Rook	Corvus frugilegus	453	96.59	
47	Carrion Crow	Corvus corone	460	98.08	
48	Coal Tit	Periparus ater	446	95.10	
49	Blue Tit	Cyanistes caeruleus	463	98.72	
50	Great Tit	Parus major	461	98.29	
51	Skylark	Alauda arvensis	440	93.82	
52	Sand Martin	Riparia riparia	426	90.83	
53	Swallow	Hirundo rustica	437	93.18	
54	House Martin	Delichon urbicum	432	92.11	
55	Long-tailed Tit	Aegithalos caudatus	453	96.59	
56	Chiffchaff	Phylloscopus collybita	441	94.03	
57	Reed Warbler	Acrocephalus scirpaceus	399	85.07	
58	Blackcap	Sylvia atricapilla	437	93.18	
59	Whitethroat	Curruca communis	421	89.77	
60	Wren	Troglodytes troglodytes	458	97.65	
61	Nuthatch	Sitta europaea	431	91.90	
62	Treecreeper	Certhia familiaris	420	89.55	
63	Starling	Sturnus vulgaris	458	97.65	
64	Song Thrush	Turdus philomelos	454	96.80	
65	Mistle Thrush	Turdus viscivorus	437	93.18	
66	Redwing	Turdus iliacus	443	94.46	
67	Blackbird	Turdus merula	462	98.51	
68	Fieldfare	Turdus pilaris	422	89.98	
69	Robin	Erithacus rubecula	462	98.51	
70	House Sparrow	Passer domesticus	458	97.65	
71	Dunnock	Prunella modularis	462	98.51	
72	Grey Wagtail	Motacilla cinerea	440	93.82	
73	Pied Wagtail	Motacilla alba	460	98.08	
74	Chaffinch	Fringilla coelebs	457	97.44	
75	Greenfinch	Chloris chloris	453	96.59	
76	Linnet	Linaria cannabina	437	93.18	
77	Goldfinch	Carduelis carduelis	454	96.80	
78	Yellowhammer	Emberiza citrinella	407	86.78	
79	Reed Bunting	Emberiza schoeniclus	439	93.60