Jim Clarke: Britain Year List 2020 BOU, Green: foot: Top Blockers Record(s) 1 to 147 of 147 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Canada Goose	Branta canadensis	2	66.67	
2	Greylag Goose	Anser anser	1	33.33	
3	Pink-footed Goose	Anser brachyrhynchus	1	33.33	
4	White-fronted Goose	Anser albifrons	1	33.33	
5	Mute Swan	Cygnus olor	2	66.67	
6	Whooper Swan	Cygnus cygnus	1	33.33	
7	Mandarin Duck	Aix galericulata	1	33.33	
8	Shoveler	Spatula clypeata	1	33.33	
9	Gadwall	Mareca strepera	1	33.33	
10	Wigeon	Mareca penelope	2	66.67	
11	Mallard	Anas platyrhynchos	2	66.67	
12	Pintail	Anas acuta	1	33.33	
13	Teal	Anas crecca	2	66.67	
14	Red-crested Pochard	Netta rufina	1	33.33	
15	Pochard	Aythya ferina	1	33.33	
16	Tufted Duck	Aythya fuligula	1	33.33	
17	Common Scoter	Melanitta nigra	2	66.67	
18	Goldeneye	Bucephala clangula	1	33.33	
19	Smew	Mergellus albellus	1	33.33	
20	Goosander	Mergus merganser	1	33.33	
21	Red Grouse	Lagopus lagopus	1	33.33	
22	Grey Partridge	Perdix perdix	1	33.33	
23	Pheasant	Phasianus colchicus	2	66.67	
24	Nightjar	Caprimulgus europaeus	1	33.33	
25	Swift	Apus apus	2	66.67	
26	Cuckoo	Cuculus canorus	1	33.33	
27	Rock Dove (Feral Pigeon)	Columba livia	2	66.67	
28	Stock Dove	Columba oenas	1	33.33	
29	Woodpigeon	Columba palumbus	2	66.67	
30	Collared Dove	Streptopelia decaocto	2	66.67	
31	Moorhen	Gallinula chloropus	1	33.33	
32	Coot	Fulica atra	1	33.33	
33	Little Grebe	Tachybaptus ruficollis	1	33.33	
34	Great Crested Grebe	Podiceps cristatus	2	66.67	
35	Oystercatcher	Haematopus ostralegus	2	66.67	
36	Golden Plover	Pluvialis apricaria	1	33.33	
37	Ringed Plover	Charadrius hiaticula	1	33.33	
38	Little Ringed Plover	Charadrius dubius	1	33.33	
39	Lapwing	Vanellus vanellus	2	66.67	
40	Curlew	Numenius arquata	2	66.67	
41	Black-tailed Godwit	Limosa limosa	2	66.67	
42	Woodcock	Scolopax rusticola	1	33.33	
43	Snipe	Gallinago gallinago	2	66.67	
44	Common Sandpiper	Actitis hypoleucos	2	66.67	
45	Green Sandpiper	Tringa ochropus	1	33.33	
46	Redshank	Tringa totanus	2	66.67	
47	Spotted Redshank	Tringa erythropus	1	33.33	
48	Knot	Calidris canutus	2	66.67	
49	Ruff	Calidris pugnax	1	33.33	
50	Dunlin	Calidris alpina	2	66.67	
51	Black-headed Gull	Chroicocephalus ridibundus	2	66.67	
52	Mediterranean Gull	Ichthyaetus melanocephalus	2	66.67	
53	Common Gull	Larus canus	2	66.67	
54	Herring Gull	Larus argentatus	2	66.67	
55	Yellow-legged Gull	Larus michahellis	1	33.33	
56	Great Black-backed Gull	Larus marinus	2	66.67	
57	Lesser Black-backed Gull	Larus fuscus	2	66.67	
58	Cormorant	Phalacrocorax carbo	2	66.67	
59	Spoonbill	Platalea leucorodia	1	33.33	
60	Little Egret	Egretta garzetta	2	66.67	
61	Great White Egret	Ardea alba	1	33.33	
62	Grey Heron	Ardea cinerea	2	66.67	
63	Sparrowhawk	Accipiter nisus	2	66.67	
64	Goshawk	Accipiter gentilis	1	33.33	
65	Marsh Harrier	Circus aeruginosus	1	33.33	
66	Hen Harrier	Circus cyaneus	1	33.33	
67	Red Kite	Milvus milvus	1	33.33	
68	Buzzard	Buteo buteo	2	66.67	
69	Barn Owl	Tyto alba	1	33.33	
70	Little Owl	Athene noctua	1	33.33	
71	Long-eared Owl	Asio otus	1	33.33	
72	Short-eared Owl	Asio flammeus	1	33.33	
73	Tawny Owl	Strix aluco	1	33.33	
74	Kingfisher	Alcedo atthis	1	33.33	
75	Great Spotted Woodpecker	Dendrocopos major	2	66.67	
76	Green Woodpecker	Picus viridis	2	66.67	
77	Kestrel	Falco tinnunculus	2	66.67	
78	Merlin	Falco columbarius	1	33.33	
79	Hobby	Falco subbuteo	1	33.33	
80	Peregrine	Falco peregrinus	2	66.67	
81	Ring-necked Parakeet	Psittacula krameri	1	33.33	
82	Jay	Garrulus glandarius	2	66.67	
83	Magpie	Pica pica	2	66.67	
84	Jackdaw	Coloeus monedula	2	66.67	
85	Rook	Corvus frugilegus	2	66.67	
86	Carrion Crow	Corvus corone	2	66.67	
87	Raven	Corvus corax	2	66.67	
88	Waxwing	Bombycilla garrulus	1	33.33	
89	Coal Tit	Periparus ater	2	66.67	
90	Willow Tit	Poecile montanus	1	33.33	
91	Blue Tit	Cyanistes caeruleus	2	66.67	
92	Great Tit	Parus major	2	66.67	
93	Skylark	Alauda arvensis	2	66.67	
94	Sand Martin	Riparia riparia	1	33.33	
95	Swallow	Hirundo rustica	2	66.67	
96	House Martin	Delichon urbicum	1	33.33	
97	Cetti's Warbler	Cettia cetti	1	33.33	
98	Long-tailed Tit	Aegithalos caudatus	2	66.67	
99	Wood Warbler	Phylloscopus sibilatrix	1	33.33	
100	Willow Warbler	Phylloscopus trochilus	2	66.67	
101	Chiffchaff	Phylloscopus collybita	2	66.67	
102	Sedge Warbler	Acrocephalus schoenobaenus	1	33.33	
103	Reed Warbler	Acrocephalus scirpaceus	2	66.67	
104	Grasshopper Warbler	Locustella naevia	1	33.33	
105	Blackcap	Sylvia atricapilla	2	66.67	
106	Garden Warbler	Sylvia borin	1	33.33	
107	Lesser Whitethroat	Curruca curruca	1	33.33	
108	Whitethroat	Curruca communis	1	33.33	
109	Firecrest	Regulus ignicapilla	2	66.67	
110	Goldcrest	Regulus regulus	2	66.67	
111	Wren	Troglodytes troglodytes	2	66.67	
112	Nuthatch	Sitta europaea	1	33.33	
113	Treecreeper	Certhia familiaris	1	33.33	
114	Starling	Sturnus vulgaris	2	66.67	
115	Song Thrush	Turdus philomelos	2	66.67	
116	Mistle Thrush	Turdus viscivorus	2	66.67	
117	Redwing	Turdus iliacus	2	66.67	
118	Blackbird	Turdus merula	2	66.67	
119	Fieldfare	Turdus pilaris	2	66.67	
120	Ring Ouzel	Turdus torquatus	1	33.33	
121	Spotted Flycatcher	Muscicapa striata	1	33.33	
122	Robin	Erithacus rubecula	2	66.67	
123	Pied Flycatcher	Ficedula hypoleuca	1	33.33	
124	Black Redstart	Phoenicurus ochruros	1	33.33	
125	Redstart	Phoenicurus phoenicurus	1	33.33	
126	Whinchat	Saxicola rubetra	1	33.33	
127	Stonechat	Saxicola rubicola	2	66.67	
128	Wheatear	Oenanthe oenanthe	2	66.67	
129	Dipper	Cinclus cinclus	1	33.33	
130	Tree Sparrow	Passer montanus	1	33.33	
131	House Sparrow	Passer domesticus	2	66.67	
132	Dunnock	Prunella modularis	2	66.67	
133	Yellow Wagtail	Motacilla flava	1	33.33	
134	Grey Wagtail	Motacilla cinerea	2	66.67	
135	Pied Wagtail	Motacilla alba	2	66.67	
136	Meadow Pipit	Anthus pratensis	2	66.67	
137	Tree Pipit	Anthus trivialis	1	33.33	
138	Chaffinch	Fringilla coelebs	2	66.67	
139	Bullfinch	Pyrrhula pyrrhula	2	66.67	
140	Greenfinch	Chloris chloris	2	66.67	
141	Linnet	Linaria cannabina	2	66.67	
142	Lesser Redpoll	Acanthis cabaret	1	33.33	
143	Common Crossbill	Loxia curvirostra	1	33.33	
144	Goldfinch	Carduelis carduelis	2	66.67	
145	Siskin	Spinus spinus	1	33.33	
146	Yellowhammer	Emberiza citrinella	1	33.33	
147	Reed Bunting	Emberiza schoeniclus	1	33.33