Marc Outten: Britain Year List 2020 BOU, All records: Top Blockers Record(s) 1 to 109 of 109 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Brent Goose	Branta bernicla	317	77.13	
2	Canada Goose	Branta canadensis	397	96.59	
3	Barnacle Goose	Branta leucopsis	273	66.42	
4	Greylag Goose	Anser anser	390	94.89	
5	Tundra Bean Goose	Anser serrirostris	161	39.17	
6	Mute Swan	Cygnus olor	399	97.08	
7	Bewick's Swan	Cygnus columbianus	176	42.82	
8	Egyptian Goose	Alopochen aegyptiaca	304	73.97	
9	Shelduck	Tadorna tadorna	382	92.94	
10	Shoveler	Spatula clypeata	379	92.21	
11	Gadwall	Mareca strepera	381	92.70	
12	Wigeon	Mareca penelope	387	94.16	
13	Mallard	Anas platyrhynchos	401	97.57	
14	Teal	Anas crecca	386	93.92	
15	Pochard	Aythya ferina	365	88.81	
16	Tufted Duck	Aythya fuligula	395	96.11	
17	Scaup	Aythya marila	247	60.10	
18	Goldeneye	Bucephala clangula	345	83.94	
19	Smew	Mergellus albellus	189	45.99	
20	Goosander	Mergus merganser	348	84.67	
21	Pheasant	Phasianus colchicus	393	95.62	
22	Red-legged Partridge	Alectoris rufa	322	78.35	
23	Stock Dove	Columba oenas	362	88.08	
24	Woodpigeon	Columba palumbus	402	97.81	
25	Collared Dove	Streptopelia decaocto	391	95.13	
26	Water Rail	Rallus aquaticus	289	70.32	
27	Moorhen	Gallinula chloropus	397	96.59	
28	Coot	Fulica atra	396	96.35	
29	Little Grebe	Tachybaptus ruficollis	377	91.73	
30	Great Crested Grebe	Podiceps cristatus	378	91.97	
31	Oystercatcher	Haematopus ostralegus	380	92.46	
32	Avocet	Recurvirostra avosetta	313	76.16	
33	Grey Plover	Pluvialis squatarola	300	72.99	
34	Golden Plover	Pluvialis apricaria	335	81.51	
35	Ringed Plover	Charadrius hiaticula	334	81.27	
36	Lapwing	Vanellus vanellus	394	95.86	
37	Curlew	Numenius arquata	374	91.00	
38	Black-tailed Godwit	Limosa limosa	357	86.86	
39	Woodcock	Scolopax rusticola	245	59.61	
40	Snipe	Gallinago gallinago	350	85.16	
41	Green Sandpiper	Tringa ochropus	288	70.07	
42	Redshank	Tringa totanus	372	90.51	
43	Turnstone	Arenaria interpres	345	83.94	
44	Knot	Calidris canutus	301	73.24	
45	Sanderling	Calidris alba	298	72.51	
46	Dunlin	Calidris alpina	357	86.86	
47	Kittiwake	Rissa tridactyla	270	65.69	
48	Black-headed Gull	Chroicocephalus ridibundus	394	95.86	
49	Mediterranean Gull	Ichthyaetus melanocephalus	310	75.43	
50	Common Gull	Larus canus	367	89.29	
51	Herring Gull	Larus argentatus	389	94.65	
52	Great Black-backed Gull	Larus marinus	374	91.00	
53	Lesser Black-backed Gull	Larus fuscus	374	91.00	
54	Common Guillemot	Uria aalge	282	68.61	
55	Red-throated Diver	Gavia stellata	243	59.12	
56	Gannet	Morus bassanus	318	77.37	
57	Cormorant	Phalacrocorax carbo	393	95.62	
58	Little Egret	Egretta garzetta	388	94.40	
59	Great White Egret	Ardea alba	337	82.00	
60	Grey Heron	Ardea cinerea	393	95.62	
61	Sparrowhawk	Accipiter nisus	384	93.43	
62	Marsh Harrier	Circus aeruginosus	349	84.91	
63	Hen Harrier	Circus cyaneus	236	57.42	
64	Buzzard	Buteo buteo	391	95.13	
65	Barn Owl	Tyto alba	336	81.75	
66	Short-eared Owl	Asio flammeus	243	59.12	
67	Kingfisher	Alcedo atthis	358	87.10	
68	Great Spotted Woodpecker	Dendrocopos major	382	92.94	
69	Green Woodpecker	Picus viridis	340	82.73	
70	Kestrel	Falco tinnunculus	394	95.86	
71	Merlin	Falco columbarius	254	61.80	
72	Ring-necked Parakeet	Psittacula krameri	234	56.93	
73	Jay	Garrulus glandarius	376	91.48	
74	Magpie	Pica pica	399	97.08	
75	Jackdaw	Coloeus monedula	393	95.62	
76	Rook	Corvus frugilegus	388	94.40	
77	Carrion Crow	Corvus corone	398	96.84	
78	Raven	Corvus corax	341	82.97	
79	Coal Tit	Periparus ater	387	94.16	
80	Blue Tit	Cyanistes caeruleus	398	96.84	
81	Great Tit	Parus major	398	96.84	
82	Bearded Tit	Panurus biarmicus	210	51.09	
83	Skylark	Alauda arvensis	369	89.78	
84	Cetti's Warbler	Cettia cetti	313	76.16	
85	Long-tailed Tit	Aegithalos caudatus	392	95.38	
86	Chiffchaff	Phylloscopus collybita	373	90.75	
87	Firecrest	Regulus ignicapilla	205	49.88	
88	Goldcrest	Regulus regulus	368	89.54	
89	Wren	Troglodytes troglodytes	395	96.11	
90	Starling	Sturnus vulgaris	397	96.59	
91	Song Thrush	Turdus philomelos	389	94.65	
92	Redwing	Turdus iliacus	384	93.43	
93	Blackbird	Turdus merula	397	96.59	
94	Fieldfare	Turdus pilaris	361	87.83	
95	Robin	Erithacus rubecula	398	96.84	
96	Stonechat	Saxicola rubicola	375	91.24	
97	House Sparrow	Passer domesticus	396	96.35	
98	Dunnock	Prunella modularis	394	95.86	
99	Pied Wagtail	Motacilla alba	395	96.11	
100	Meadow Pipit	Anthus pratensis	373	90.75	
101	Water Pipit	Anthus spinoletta	172	41.85	
102	Rock Pipit	Anthus petrosus	290	70.56	
103	Chaffinch	Fringilla coelebs	397	96.59	
104	Greenfinch	Chloris chloris	377	91.73	
105	Linnet	Linaria cannabina	368	89.54	
106	Goldfinch	Carduelis carduelis	393	95.62	
107	Corn Bunting	Emberiza calandra	216	52.55	
108	Yellowhammer	Emberiza citrinella	349	84.91	
109	Reed Bunting	Emberiza schoeniclus	377	91.73