Sam Finch: Britain Year List 2021 BOU, All records: Top Blockers Record(s) 1 to 124 of 124 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	White-fronted Goose	Anser albifrons	238	50.75	
4	Mute Swan	Cygnus olor	461	98.29	
5	Shelduck	Tadorna tadorna	441	94.03	
6	Shoveler	Spatula clypeata	444	94.67	
7	Gadwall	Mareca strepera	442	94.24	
8	Wigeon	Mareca penelope	442	94.24	
9	Mallard	Anas platyrhynchos	461	98.29	
10	Teal	Anas crecca	445	94.88	
11	Pochard	Aythya ferina	426	90.83	
12	Ring-necked Duck	Aythya collaris	190	40.51	
13	Tufted Duck	Aythya fuligula	457	97.44	
14	Lesser Scaup	Aythya affinis	16	3.41	
15	Goldeneye	Bucephala clangula	383	81.66	
16	Goosander	Mergus merganser	390	83.16	
17	Pheasant	Phasianus colchicus	454	96.80	
18	Swift	Apus apus	430	91.68	
19	Cuckoo	Cuculus canorus	382	81.45	
20	Rock Dove (Feral Pigeon)	Columba livia	403	85.93	
21	Stock Dove	Columba oenas	416	88.70	
22	Woodpigeon	Columba palumbus	463	98.72	
23	Collared Dove	Streptopelia decaocto	453	96.59	
24	Moorhen	Gallinula chloropus	458	97.65	
25	Coot	Fulica atra	456	97.23	
26	Little Grebe	Tachybaptus ruficollis	443	94.46	
27	Great Crested Grebe	Podiceps cristatus	447	95.31	
28	Oystercatcher	Haematopus ostralegus	448	95.52	
29	Golden Plover	Pluvialis apricaria	389	82.94	
30	American Golden Plover	Pluvialis dominica	73	15.57	
31	Lapwing	Vanellus vanellus	453	96.59	
32	Eurasian Whimbrel	Numenius phaeopus	349	74.41	
33	Curlew	Numenius arquata	436	92.96	
34	Bar-tailed Godwit	Limosa lapponica	368	78.46	
35	Black-tailed Godwit	Limosa limosa	411	87.63	
36	Snipe	Gallinago gallinago	413	88.06	
37	Common Sandpiper	Actitis hypoleucos	397	84.65	
38	Green Sandpiper	Tringa ochropus	351	74.84	
39	Wood Sandpiper	Tringa glareola	270	57.57	
40	Redshank	Tringa totanus	434	92.54	
41	Greenshank	Tringa nebularia	382	81.45	
42	Turnstone	Arenaria interpres	411	87.63	
43	Sanderling	Calidris alba	369	78.68	
44	Dunlin	Calidris alpina	418	89.13	
45	Little Stint	Calidris minuta	290	61.83	
46	Sabine's Gull	Xema sabini	38	8.10	
47	Black-headed Gull	Chroicocephalus ridibundus	460	98.08	
48	Mediterranean Gull	Ichthyaetus melanocephalus	366	78.04	
49	Common Gull	Larus canus	418	89.13	
50	Herring Gull	Larus argentatus	457	97.44	
51	Great Black-backed Gull	Larus marinus	433	92.32	
52	Glaucous Gull	Larus hyperboreus	88	18.76	
53	Lesser Black-backed Gull	Larus fuscus	448	95.52	
54	American Herring Gull	Larus smithsonianus	51	10.87	
55	Iceland Gull	Larus glaucoides	158	33.69	
56	Razorbill	Alca torda	377	80.38	
57	Common Guillemot	Uria aalge	387	82.52	
58	Red-throated Diver	Gavia stellata	330	70.36	
59	Great Northern Diver	Gavia immer	287	61.19	
60	Fulmar	Fulmarus glacialis	389	82.94	
61	Manx Shearwater	Puffinus puffinus	246	52.45	
62	Gannet	Morus bassanus	405	86.35	
63	Cormorant	Phalacrocorax carbo	457	97.44	
64	Shag	Gulosus aristotelis	370	78.89	
65	Spoonbill	Platalea leucorodia	335	71.43	
66	Bittern	Botaurus stellaris	294	62.69	
67	Little Egret	Egretta garzetta	444	94.67	
68	Grey Heron	Ardea cinerea	454	96.80	
69	Sparrowhawk	Accipiter nisus	443	94.46	
70	Hen Harrier	Circus cyaneus	227	48.40	
71	Red Kite	Milvus milvus	434	92.54	
72	Buzzard	Buteo buteo	457	97.44	
73	Barn Owl	Tyto alba	371	79.10	
74	Hoopoe	Upupa epops	92	19.62	
75	Kestrel	Falco tinnunculus	453	96.59	
76	Merlin	Falco columbarius	275	58.64	
77	Hobby	Falco subbuteo	347	73.99	
78	Peregrine	Falco peregrinus	421	89.77	
79	Jay	Garrulus glandarius	447	95.31	
80	Magpie	Pica pica	460	98.08	
81	Chough	Pyrrhocorax pyrrhocorax	194	41.36	
82	Jackdaw	Coloeus monedula	459	97.87	
83	Rook	Corvus frugilegus	453	96.59	
84	Carrion Crow	Corvus corone	460	98.08	
85	Raven	Corvus corax	415	88.49	
86	Coal Tit	Periparus ater	446	95.10	
87	Blue Tit	Cyanistes caeruleus	463	98.72	
88	Great Tit	Parus major	461	98.29	
89	Skylark	Alauda arvensis	440	93.82	
90	Sand Martin	Riparia riparia	426	90.83	
91	Swallow	Hirundo rustica	437	93.18	
92	House Martin	Delichon urbicum	432	92.11	
93	Long-tailed Tit	Aegithalos caudatus	453	96.59	
94	Willow Warbler	Phylloscopus trochilus	415	88.49	
95	Chiffchaff	Phylloscopus collybita	441	94.03	
96	Sedge Warbler	Acrocephalus schoenobaenus	413	88.06	
97	Reed Warbler	Acrocephalus scirpaceus	399	85.07	
98	Whitethroat	Curruca communis	421	89.77	
99	Wren	Troglodytes troglodytes	458	97.65	
100	Nuthatch	Sitta europaea	431	91.90	
101	Treecreeper	Certhia familiaris	420	89.55	
102	Starling	Sturnus vulgaris	458	97.65	
103	Song Thrush	Turdus philomelos	454	96.80	
104	Mistle Thrush	Turdus viscivorus	437	93.18	
105	Redwing	Turdus iliacus	443	94.46	
106	Blackbird	Turdus merula	462	98.51	
107	Ring Ouzel	Turdus torquatus	261	55.65	
108	Robin	Erithacus rubecula	462	98.51	
109	Stonechat	Saxicola rubicola	432	92.11	
110	Wheatear	Oenanthe oenanthe	409	87.21	
111	Dipper	Cinclus cinclus	289	61.62	
112	House Sparrow	Passer domesticus	458	97.65	
113	Dunnock	Prunella modularis	462	98.51	
114	Grey Wagtail	Motacilla cinerea	440	93.82	
115	Pied Wagtail	Motacilla alba	460	98.08	
116	Meadow Pipit	Anthus pratensis	434	92.54	
117	Rock Pipit	Anthus petrosus	372	79.32	
118	Chaffinch	Fringilla coelebs	457	97.44	
119	Bullfinch	Pyrrhula pyrrhula	429	91.47	
120	Greenfinch	Chloris chloris	453	96.59	
121	Linnet	Linaria cannabina	437	93.18	
122	Goldfinch	Carduelis carduelis	454	96.80	
123	Siskin	Spinus spinus	414	88.27	
124	Reed Bunting	Emberiza schoeniclus	439	93.60