Simon Gillings: Britain Year List 2021 BOU, Green: non-motorised: Top Blockers Record(s) 1 to 199 of 199 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Canada Goose	Branta canadensis	18	75.00	
2	Barnacle Goose	Branta leucopsis	7	29.17	
3	Greylag Goose	Anser anser	18	75.00	
4	Pink-footed Goose	Anser brachyrhynchus	12	50.00	
5	White-fronted Goose	Anser albifrons	8	33.33	
6	Mute Swan	Cygnus olor	20	83.33	
7	Bewick's Swan	Cygnus columbianus	3	12.50	
8	Whooper Swan	Cygnus cygnus	11	45.83	
9	Egyptian Goose	Alopochen aegyptiaca	10	41.67	
10	Shelduck	Tadorna tadorna	18	75.00	
11	Mandarin Duck	Aix galericulata	12	50.00	
12	Garganey	Spatula querquedula	6	25.00	
13	Shoveler	Spatula clypeata	13	54.17	
14	Gadwall	Mareca strepera	14	58.33	
15	Wigeon	Mareca penelope	19	79.17	
16	American Wigeon	Mareca americana	3	12.50	
17	Mallard	Anas platyrhynchos	23	95.83	
18	Pintail	Anas acuta	7	29.17	
19	Teal	Anas crecca	21	87.50	
20	Red-crested Pochard	Netta rufina	4	16.67	
21	Pochard	Aythya ferina	11	45.83	
22	Tufted Duck	Aythya fuligula	19	79.17	
23	Common Scoter	Melanitta nigra	12	50.00	
24	Goldeneye	Bucephala clangula	10	41.67	
25	Smew	Mergellus albellus	5	20.83	
26	Goosander	Mergus merganser	17	70.83	
27	Red-breasted Merganser	Mergus serrator	10	41.67	
28	Grey Partridge	Perdix perdix	7	29.17	
29	Pheasant	Phasianus colchicus	22	91.67	
30	Quail	Coturnix coturnix	4	16.67	
31	Red-legged Partridge	Alectoris rufa	14	58.33	
32	Nightjar	Caprimulgus europaeus	8	33.33	
33	Swift	Apus apus	16	66.67	
34	Cuckoo	Cuculus canorus	15	62.50	
35	Rock Dove (Feral Pigeon)	Columba livia	17	70.83	
36	Stock Dove	Columba oenas	16	66.67	
37	Woodpigeon	Columba palumbus	23	95.83	
38	Turtle Dove	Streptopelia turtur	4	16.67	
39	Collared Dove	Streptopelia decaocto	23	95.83	
40	Water Rail	Rallus aquaticus	13	54.17	
41	Corncrake	Crex crex	2	8.33	
42	Spotted Crake	Porzana porzana	2	8.33	
43	Moorhen	Gallinula chloropus	21	87.50	
44	Coot	Fulica atra	18	75.00	
45	Crane	Grus grus	5	20.83	
46	Little Grebe	Tachybaptus ruficollis	18	75.00	
47	Great Crested Grebe	Podiceps cristatus	15	62.50	
48	Stone-curlew	Burhinus oedicnemus	4	16.67	
49	Oystercatcher	Haematopus ostralegus	19	79.17	
50	Avocet	Recurvirostra avosetta	11	45.83	
51	Grey Plover	Pluvialis squatarola	11	45.83	
52	Golden Plover	Pluvialis apricaria	14	58.33	
53	Ringed Plover	Charadrius hiaticula	14	58.33	
54	Little Ringed Plover	Charadrius dubius	11	45.83	
55	Lapwing	Vanellus vanellus	22	91.67	
56	Eurasian Whimbrel	Numenius phaeopus	10	41.67	
57	Curlew	Numenius arquata	18	75.00	
58	Bar-tailed Godwit	Limosa lapponica	10	41.67	
59	Black-tailed Godwit	Limosa limosa	12	50.00	
60	Jack Snipe	Lymnocryptes minimus	8	33.33	
61	Woodcock	Scolopax rusticola	12	50.00	
62	Snipe	Gallinago gallinago	17	70.83	
63	Common Sandpiper	Actitis hypoleucos	15	62.50	
64	Green Sandpiper	Tringa ochropus	9	37.50	
65	Wood Sandpiper	Tringa glareola	6	25.00	
66	Redshank	Tringa totanus	19	79.17	
67	Spotted Redshank	Tringa erythropus	5	20.83	
68	Greenshank	Tringa nebularia	12	50.00	
69	Turnstone	Arenaria interpres	15	62.50	
70	Knot	Calidris canutus	10	41.67	
71	Ruff	Calidris pugnax	8	33.33	
72	Curlew Sandpiper	Calidris ferruginea	5	20.83	
73	Temminck's Stint	Calidris temminckii	2	8.33	
74	Sanderling	Calidris alba	10	41.67	
75	Dunlin	Calidris alpina	16	66.67	
76	Little Stint	Calidris minuta	6	25.00	
77	White-rumped Sandpiper	Calidris fuscicollis	3	12.50	
78	Pectoral Sandpiper	Calidris melanotos	5	20.83	
79	Little Tern	Sternula albifrons	6	25.00	
80	Black Tern	Chlidonias niger	4	16.67	
81	Arctic Tern	Sterna paradisaea	7	29.17	
82	Common Tern	Sterna hirundo	11	45.83	
83	Sandwich Tern	Thalasseus sandvicensis	8	33.33	
84	Little Gull	Hydrocoloeus minutus	6	25.00	
85	Kittiwake	Rissa tridactyla	11	45.83	
86	Black-headed Gull	Chroicocephalus ridibundus	23	95.83	
87	Mediterranean Gull	Ichthyaetus melanocephalus	11	45.83	
88	Common Gull	Larus canus	21	87.50	
89	Caspian Gull	Larus cachinnans	7	29.17	
90	Herring Gull	Larus argentatus	22	91.67	
91	Yellow-legged Gull	Larus michahellis	10	41.67	
92	Great Black-backed Gull	Larus marinus	18	75.00	
93	Lesser Black-backed Gull	Larus fuscus	21	87.50	
94	Iceland Gull	Larus glaucoides	5	20.83	
95	Arctic Skua	Stercorarius parasiticus	5	20.83	
96	Red-throated Diver	Gavia stellata	9	37.50	
97	Great Northern Diver	Gavia immer	7	29.17	
98	Fulmar	Fulmarus glacialis	9	37.50	
99	Balearic Shearwater	Puffinus mauretanicus	3	12.50	
100	Gannet	Morus bassanus	9	37.50	
101	Cormorant	Phalacrocorax carbo	23	95.83	
102	Shag	Gulosus aristotelis	9	37.50	
103	Glossy Ibis	Plegadis falcinellus	5	20.83	
104	Spoonbill	Platalea leucorodia	6	25.00	
105	Bittern	Botaurus stellaris	6	25.00	
106	Little Egret	Egretta garzetta	21	87.50	
107	Cattle Egret	Bubulcus ibis	7	29.17	
108	Great White Egret	Ardea alba	10	41.67	
109	Grey Heron	Ardea cinerea	23	95.83	
110	Osprey	Pandion haliaetus	8	33.33	
111	Sparrowhawk	Accipiter nisus	22	91.67	
112	Marsh Harrier	Circus aeruginosus	11	45.83	
113	Hen Harrier	Circus cyaneus	8	33.33	
114	Red Kite	Milvus milvus	16	66.67	
115	Buzzard	Buteo buteo	22	91.67	
116	Barn Owl	Tyto alba	14	58.33	
117	Little Owl	Athene noctua	10	41.67	
118	Long-eared Owl	Asio otus	6	25.00	
119	Short-eared Owl	Asio flammeus	8	33.33	
120	Tawny Owl	Strix aluco	17	70.83	
121	Roller	Coracias garrulus	2	8.33	
122	Kingfisher	Alcedo atthis	17	70.83	
123	Great Spotted Woodpecker	Dendrocopos major	22	91.67	
124	Green Woodpecker	Picus viridis	16	66.67	
125	Kestrel	Falco tinnunculus	22	91.67	
126	Merlin	Falco columbarius	11	45.83	
127	Hobby	Falco subbuteo	10	41.67	
128	Peregrine	Falco peregrinus	18	75.00	
129	Great Grey Shrike	Lanius excubitor	1	4.17	
130	Jay	Garrulus glandarius	22	91.67	
131	Magpie	Pica pica	22	91.67	
132	Jackdaw	Coloeus monedula	23	95.83	
133	Rook	Corvus frugilegus	20	83.33	
134	Carrion Crow	Corvus corone	23	95.83	
135	Raven	Corvus corax	17	70.83	
136	Coal Tit	Periparus ater	21	87.50	
137	Marsh Tit	Poecile palustris	9	37.50	
138	Blue Tit	Cyanistes caeruleus	23	95.83	
139	Great Tit	Parus major	23	95.83	
140	Bearded Tit	Panurus biarmicus	6	25.00	
141	Skylark	Alauda arvensis	20	83.33	
142	Sand Martin	Riparia riparia	17	70.83	
143	Swallow	Hirundo rustica	18	75.00	
144	House Martin	Delichon urbicum	17	70.83	
145	Cetti's Warbler	Cettia cetti	12	50.00	
146	Long-tailed Tit	Aegithalos caudatus	21	87.50	
147	Yellow-browed Warbler	Phylloscopus inornatus	3	12.50	
148	Willow Warbler	Phylloscopus trochilus	18	75.00	
149	Chiffchaff	Phylloscopus collybita	22	91.67	
150	Great Reed Warbler	Acrocephalus arundinaceus	1	4.17	
151	Sedge Warbler	Acrocephalus schoenobaenus	15	62.50	
152	Reed Warbler	Acrocephalus scirpaceus	12	50.00	
153	Savi's Warbler	Locustella luscinioides	4	16.67	
154	Grasshopper Warbler	Locustella naevia	11	45.83	
155	Blackcap	Sylvia atricapilla	22	91.67	
156	Garden Warbler	Sylvia borin	11	45.83	
157	Lesser Whitethroat	Curruca curruca	11	45.83	
158	Whitethroat	Curruca communis	17	70.83	
159	Firecrest	Regulus ignicapilla	7	29.17	
160	Goldcrest	Regulus regulus	22	91.67	
161	Wren	Troglodytes troglodytes	23	95.83	
162	Nuthatch	Sitta europaea	17	70.83	
163	Treecreeper	Certhia familiaris	19	79.17	
164	Starling	Sturnus vulgaris	23	95.83	
165	Song Thrush	Turdus philomelos	23	95.83	
166	Mistle Thrush	Turdus viscivorus	21	87.50	
167	Redwing	Turdus iliacus	22	91.67	
168	Blackbird	Turdus merula	23	95.83	
169	Fieldfare	Turdus pilaris	19	79.17	
170	Ring Ouzel	Turdus torquatus	8	33.33	
171	Spotted Flycatcher	Muscicapa striata	11	45.83	
172	Robin	Erithacus rubecula	23	95.83	
173	Nightingale	Luscinia megarhynchos	7	29.17	
174	Pied Flycatcher	Ficedula hypoleuca	10	41.67	
175	Black Redstart	Phoenicurus ochruros	10	41.67	
176	Redstart	Phoenicurus phoenicurus	11	45.83	
177	Whinchat	Saxicola rubetra	11	45.83	
178	Stonechat	Saxicola rubicola	20	83.33	
179	Wheatear	Oenanthe oenanthe	15	62.50	
180	Tree Sparrow	Passer montanus	8	33.33	
181	House Sparrow	Passer domesticus	23	95.83	
182	Dunnock	Prunella modularis	23	95.83	
183	Yellow Wagtail	Motacilla flava	12	50.00	
184	Grey Wagtail	Motacilla cinerea	21	87.50	
185	Pied Wagtail	Motacilla alba	23	95.83	
186	Meadow Pipit	Anthus pratensis	20	83.33	
187	Water Pipit	Anthus spinoletta	7	29.17	
188	Rock Pipit	Anthus petrosus	13	54.17	
189	Chaffinch	Fringilla coelebs	22	91.67	
190	Brambling	Fringilla montifringilla	15	62.50	
191	Bullfinch	Pyrrhula pyrrhula	20	83.33	
192	Greenfinch	Chloris chloris	20	83.33	
193	Linnet	Linaria cannabina	19	79.17	
194	Lesser Redpoll	Acanthis cabaret	12	50.00	
195	Goldfinch	Carduelis carduelis	23	95.83	
196	Siskin	Spinus spinus	20	83.33	
197	Corn Bunting	Emberiza calandra	6	25.00	
198	Yellowhammer	Emberiza citrinella	13	54.17	
199	Reed Bunting	Emberiza schoeniclus	17	70.83