Charles Farrell: London Area Year List 2020 BOU, All records: Top Blockers Record(s) 1 to 76 of 76 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Canada Goose	Branta canadensis	1	100.00	
2	Greylag Goose	Anser anser	1	100.00	
3	Mute Swan	Cygnus olor	1	100.00	
4	Egyptian Goose	Alopochen aegyptiaca	1	100.00	
5	Shelduck	Tadorna tadorna	1	100.00	
6	Mandarin Duck	Aix galericulata	1	100.00	
7	Shoveler	Spatula clypeata	1	100.00	
8	Gadwall	Mareca strepera	1	100.00	
9	Wigeon	Mareca penelope	1	100.00	
10	Mallard	Anas platyrhynchos	1	100.00	
11	Teal	Anas crecca	1	100.00	
12	Red-crested Pochard	Netta rufina	1	100.00	
13	Pochard	Aythya ferina	1	100.00	
14	Tufted Duck	Aythya fuligula	1	100.00	
15	Goldeneye	Bucephala clangula	1	100.00	
16	Goosander	Mergus merganser	1	100.00	
17	Pheasant	Phasianus colchicus	1	100.00	
18	Red-legged Partridge	Alectoris rufa	1	100.00	
19	Rock Dove (Feral Pigeon)	Columba livia	1	100.00	
20	Stock Dove	Columba oenas	1	100.00	
21	Woodpigeon	Columba palumbus	1	100.00	
22	Collared Dove	Streptopelia decaocto	1	100.00	
23	Moorhen	Gallinula chloropus	1	100.00	
24	Coot	Fulica atra	1	100.00	
25	Little Grebe	Tachybaptus ruficollis	1	100.00	
26	Great Crested Grebe	Podiceps cristatus	1	100.00	
27	Black-necked Grebe	Podiceps nigricollis	1	100.00	
28	Black-headed Gull	Chroicocephalus ridibundus	1	100.00	
29	Mediterranean Gull	Ichthyaetus melanocephalus	1	100.00	
30	Common Gull	Larus canus	1	100.00	
31	Herring Gull	Larus argentatus	1	100.00	
32	Yellow-legged Gull	Larus michahellis	1	100.00	
33	Great Black-backed Gull	Larus marinus	1	100.00	
34	Lesser Black-backed Gull	Larus fuscus	1	100.00	
35	Cormorant	Phalacrocorax carbo	1	100.00	
36	Grey Heron	Ardea cinerea	1	100.00	
37	Sparrowhawk	Accipiter nisus	1	100.00	
38	Red Kite	Milvus milvus	1	100.00	
39	Buzzard	Buteo buteo	1	100.00	
40	Great Spotted Woodpecker	Dendrocopos major	1	100.00	
41	Green Woodpecker	Picus viridis	1	100.00	
42	Peregrine	Falco peregrinus	1	100.00	
43	Ring-necked Parakeet	Psittacula krameri	1	100.00	
44	Jay	Garrulus glandarius	1	100.00	
45	Magpie	Pica pica	1	100.00	
46	Jackdaw	Coloeus monedula	1	100.00	
47	Carrion Crow	Corvus corone	1	100.00	
48	Coal Tit	Periparus ater	1	100.00	
49	Blue Tit	Cyanistes caeruleus	1	100.00	
50	Great Tit	Parus major	1	100.00	
51	Cetti's Warbler	Cettia cetti	1	100.00	
52	Long-tailed Tit	Aegithalos caudatus	1	100.00	
53	Willow Warbler	Phylloscopus trochilus	1	100.00	
54	Chiffchaff	Phylloscopus collybita	1	100.00	
55	Goldcrest	Regulus regulus	1	100.00	
56	Wren	Troglodytes troglodytes	1	100.00	
57	Treecreeper	Certhia familiaris	1	100.00	
58	Starling	Sturnus vulgaris	1	100.00	
59	Song Thrush	Turdus philomelos	1	100.00	
60	Mistle Thrush	Turdus viscivorus	1	100.00	
61	Redwing	Turdus iliacus	1	100.00	
62	Blackbird	Turdus merula	1	100.00	
63	Fieldfare	Turdus pilaris	1	100.00	
64	Spotted Flycatcher	Muscicapa striata	1	100.00	
65	Robin	Erithacus rubecula	1	100.00	
66	Stonechat	Saxicola rubicola	1	100.00	
67	House Sparrow	Passer domesticus	1	100.00	
68	Dunnock	Prunella modularis	1	100.00	
69	Grey Wagtail	Motacilla cinerea	1	100.00	
70	Pied Wagtail	Motacilla alba	1	100.00	
71	Meadow Pipit	Anthus pratensis	1	100.00	
72	Chaffinch	Fringilla coelebs	1	100.00	
73	Greenfinch	Chloris chloris	1	100.00	
74	Linnet	Linaria cannabina	1	100.00	
75	Goldfinch	Carduelis carduelis	1	100.00	
76	Reed Bunting	Emberiza schoeniclus	1	100.00