André Weiss: World Year List 2021 IOC, All records: Top Blockers Record(s) 1 to 250 of 250 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Greylag Goose	Anser anser	10	66.67	
2	Greater White-fronted Goose	Anser albifrons	10	66.67	
3	Mute Swan	Cygnus olor	11	73.33	
4	Whooper Swan	Cygnus cygnus	6	40.00	
5	Egyptian Goose	Alopochen aegyptiaca	10	66.67	
6	Common Shelduck	Tadorna tadorna	9	60.00	
7	Ruddy Shelduck	Tadorna ferruginea	3	20.00	
8	Mandarin Duck	Aix galericulata	3	20.00	
9	Garganey	Spatula querquedula	6	40.00	
10	Northern Shoveler	Spatula clypeata	12	80.00	
11	Gadwall	Mareca strepera	11	73.33	
12	Eurasian Wigeon	Mareca penelope	11	73.33	
13	Mallard	Anas platyrhynchos	12	80.00	
14	Northern Pintail	Anas acuta	11	73.33	
15	Eurasian Teal	Anas crecca	11	73.33	
16	Red-crested Pochard	Netta rufina	5	33.33	
17	Common Pochard	Aythya ferina	8	53.33	
18	Ferruginous Duck	Aythya nyroca	3	20.00	
19	Tufted Duck	Aythya fuligula	10	66.67	
20	Greater Scaup	Aythya marila	8	53.33	
21	Common Eider	Somateria mollissima	8	53.33	
22	Velvet Scoter	Melanitta fusca	4	26.67	
23	Common Scoter	Melanitta nigra	4	26.67	
24	Common Goldeneye	Bucephala clangula	8	53.33	
25	Common Merganser	Mergus merganser	11	73.33	
26	Red-breasted Merganser	Mergus serrator	10	66.67	
27	Rock Ptarmigan	Lagopus muta	1	6.67	
28	Common Pheasant	Phasianus colchicus	10	66.67	
29	Red-legged Partridge	Alectoris rufa	8	53.33	
30	Rock Partridge	Alectoris graeca	1	6.67	
31	Alpine Swift	Tachymarptis melba	5	33.33	
32	Common Swift	Apus apus	9	60.00	
33	Pallid Swift	Apus pallidus	3	20.00	
34	Common Cuckoo	Cuculus canorus	7	46.67	
35	Rock Dove	Columba livia	11	73.33	
36	Stock Dove	Columba oenas	8	53.33	
37	Common Wood Pigeon	Columba palumbus	10	66.67	
38	European Turtle Dove	Streptopelia turtur	5	33.33	
39	Oriental Turtle Dove	Streptopelia orientalis	2	13.33	
40	Eurasian Collared Dove	Streptopelia decaocto	10	66.67	
41	Water Rail	Rallus aquaticus	6	40.00	
42	Spotted Crake	Porzana porzana	1	6.67	
43	Common Moorhen	Gallinula chloropus	9	60.00	
44	Eurasian Coot	Fulica atra	10	66.67	
45	Red-knobbed Coot	Fulica cristata	2	13.33	
46	Western Swamphen	Porphyrio porphyrio	3	20.00	
47	Little Grebe	Tachybaptus ruficollis	10	66.67	
48	Red-necked Grebe	Podiceps grisegena	6	40.00	
49	Great Crested Grebe	Podiceps cristatus	10	66.67	
50	Horned Grebe	Podiceps auritus	6	40.00	
51	Black-necked Grebe	Podiceps nigricollis	9	60.00	
52	Eurasian Oystercatcher	Haematopus ostralegus	10	66.67	
53	Black-winged Stilt	Himantopus himantopus	6	40.00	
54	Pied Avocet	Recurvirostra avosetta	10	66.67	
55	Grey Plover	Pluvialis squatarola	11	73.33	
56	Common Ringed Plover	Charadrius hiaticula	10	66.67	
57	Little Ringed Plover	Charadrius dubius	7	46.67	
58	Northern Lapwing	Vanellus vanellus	11	73.33	
59	Kentish Plover	Anarhynchus alexandrinus	3	20.00	
60	Eurasian Curlew	Numenius arquata	10	66.67	
61	Black-tailed Godwit	Limosa limosa	9	60.00	
62	Common Snipe	Gallinago gallinago	8	53.33	
63	Red-necked Phalarope	Phalaropus lobatus	1	6.67	
64	Common Sandpiper	Actitis hypoleucos	8	53.33	
65	Green Sandpiper	Tringa ochropus	9	60.00	
66	Wood Sandpiper	Tringa glareola	8	53.33	
67	Common Redshank	Tringa totanus	10	66.67	
68	Spotted Redshank	Tringa erythropus	7	46.67	
69	Common Greenshank	Tringa nebularia	9	60.00	
70	Ruddy Turnstone	Arenaria interpres	11	73.33	
71	Red Knot	Calidris canutus	7	46.67	
72	Ruff	Calidris pugnax	9	60.00	
73	Curlew Sandpiper	Calidris ferruginea	8	53.33	
74	Temminck's Stint	Calidris temminckii	4	26.67	
75	Dunlin	Calidris alpina	12	80.00	
76	Little Stint	Calidris minuta	7	46.67	
77	Western Sandpiper	Calidris mauri	4	26.67	
78	Caspian Tern	Hydroprogne caspia	5	33.33	
79	Black Tern	Chlidonias niger	7	46.67	
80	Common Tern	Sterna hirundo	7	46.67	
81	Little Gull	Hydrocoloeus minutus	4	26.67	
82	Black-headed Gull	Chroicocephalus ridibundus	11	73.33	
83	Audouin's Gull	Ichthyaetus audouinii	2	13.33	
84	Mediterranean Gull	Ichthyaetus melanocephalus	6	40.00	
85	Common Gull	Larus canus	8	53.33	
86	Caspian Gull	Larus cachinnans	6	40.00	
87	European Herring Gull	Larus argentatus	10	66.67	
88	Yellow-legged Gull	Larus michahellis	5	33.33	
89	Great Black-backed Gull	Larus marinus	10	66.67	
90	Lesser Black-backed Gull	Larus fuscus	11	73.33	
91	Great Skua	Stercorarius skua	4	26.67	
92	Red-throated Diver	Gavia stellata	7	46.67	
93	Black-throated Diver	Gavia arctica	3	20.00	
94	Black Stork	Ciconia nigra	5	33.33	
95	White Stork	Ciconia ciconia	5	33.33	
96	Pygmy Cormorant	Microcarbo pygmaeus	3	20.00	
97	Great Cormorant	Phalacrocorax carbo	11	73.33	
98	European Shag	Gulosus aristotelis	7	46.67	
99	African Sacred Ibis	Threskiornis aethiopicus	3	20.00	
100	Glossy Ibis	Plegadis falcinellus	5	33.33	
101	Eurasian Spoonbill	Platalea leucorodia	7	46.67	
102	Eurasian Bittern	Botaurus stellaris	5	33.33	
103	Black-crowned Night Heron	Nycticorax nycticorax	7	46.67	
104	Little Egret	Egretta garzetta	11	73.33	
105	Western Cattle Egret	Bubulcus ibis	9	60.00	
106	Great Egret	Ardea alba	11	73.33	
107	Grey Heron	Ardea cinerea	11	73.33	
108	Purple Heron	Ardea purpurea	6	40.00	
109	Osprey	Pandion haliaetus	7	46.67	
110	Bearded Vulture	Gypaetus barbatus	2	13.33	
111	European Honey Buzzard	Pernis apivorus	5	33.33	
112	Cinereous Vulture	Aegypius monachus	2	13.33	
113	Short-toed Snake Eagle	Circaetus gallicus	4	26.67	
114	Booted Eagle	Hieraaetus pennatus	4	26.67	
115	Golden Eagle	Aquila chrysaetos	5	33.33	
116	Eurasian Sparrowhawk	Accipiter nisus	9	60.00	
117	Eurasian Goshawk	Accipiter gentilis	4	26.67	
118	Western Marsh Harrier	Circus aeruginosus	9	60.00	
119	Hen Harrier	Circus cyaneus	5	33.33	
120	Montagu's Harrier	Circus pygargus	3	20.00	
121	Red Kite	Milvus milvus	10	66.67	
122	Black Kite	Milvus migrans	3	20.00	
123	Common Buzzard	Buteo buteo	12	80.00	
124	Western Barn Owl	Tyto alba	6	40.00	
125	Long-eared Owl	Asio otus	3	20.00	
126	Tawny Owl	Strix aluco	7	46.67	
127	Eurasian Hoopoe	Upupa epops	4	26.67	
128	Common Kingfisher	Alcedo atthis	8	53.33	
129	European Bee-eater	Merops apiaster	5	33.33	
130	Eurasian Wryneck	Jynx torquilla	3	20.00	
131	Middle Spotted Woodpecker	Dendrocoptes medius	4	26.67	
132	Lesser Spotted Woodpecker	Dryobates minor	5	33.33	
133	Great Spotted Woodpecker	Dendrocopos major	10	66.67	
134	Black Woodpecker	Dryocopus martius	3	20.00	
135	European Green Woodpecker	Picus viridis	10	66.67	
136	Grey-headed Woodpecker	Picus canus	3	20.00	
137	Common Kestrel	Falco tinnunculus	12	80.00	
138	Red-footed Falcon	Falco vespertinus	4	26.67	
139	Eurasian Hobby	Falco subbuteo	5	33.33	
140	Peregrine Falcon	Falco peregrinus	10	66.67	
141	Rose-ringed Parakeet	Psittacula krameri	5	33.33	
142	Eurasian Golden Oriole	Oriolus oriolus	4	26.67	
143	Great Grey Shrike	Lanius excubitor	3	20.00	
144	Red-backed Shrike	Lanius collurio	6	40.00	
145	Eurasian Jay	Garrulus glandarius	10	66.67	
146	Eurasian Magpie	Pica pica	12	80.00	
147	Spotted Nutcracker	Nucifraga caryocatactes	1	6.67	
148	Alpine Chough	Pyrrhocorax graculus	2	13.33	
149	Western Jackdaw	Coloeus monedula	9	60.00	
150	Rook	Corvus frugilegus	9	60.00	
151	Carrion Crow	Corvus corone	11	73.33	
152	Hooded Crow	Corvus cornix	6	40.00	
153	Northern Raven	Corvus corax	11	73.33	
154	Coal Tit	Periparus ater	10	66.67	
155	Crested Tit	Lophophanes cristatus	5	33.33	
156	Marsh Tit	Poecile palustris	6	40.00	
157	Willow Tit	Poecile montanus	5	33.33	
158	Eurasian Blue Tit	Cyanistes caeruleus	11	73.33	
159	Great Tit	Parus major	11	73.33	
160	Bearded Reedling	Panurus biarmicus	5	33.33	
161	Woodlark	Lullula arborea	3	20.00	
162	Eurasian Skylark	Alauda arvensis	9	60.00	
163	Thekla's Lark	Galerida theklae	3	20.00	
164	Sand Martin	Riparia riparia	10	66.67	
165	Eurasian Crag Martin	Ptyonoprogne rupestris	2	13.33	
166	Barn Swallow	Hirundo rustica	12	80.00	
167	Western House Martin	Delichon urbicum	7	46.67	
168	Red-rumped Swallow	Cecropis daurica	4	26.67	
169	Cetti's Warbler	Cettia cetti	6	40.00	
170	Long-tailed Tit	Aegithalos caudatus	11	73.33	
171	Wood Warbler	Phylloscopus sibilatrix	3	20.00	
172	Western Bonelli's Warbler	Phylloscopus bonelli	4	26.67	
173	Willow Warbler	Phylloscopus trochilus	8	53.33	
174	Common Chiffchaff	Phylloscopus collybita	10	66.67	
175	Great Reed Warbler	Acrocephalus arundinaceus	3	20.00	
176	Sedge Warbler	Acrocephalus schoenobaenus	8	53.33	
177	Common Reed Warbler	Acrocephalus scirpaceus	7	46.67	
178	Marsh Warbler	Acrocephalus palustris	3	20.00	
179	Melodious Warbler	Hippolais polyglotta	2	13.33	
180	Savi's Warbler	Locustella luscinioides	3	20.00	
181	Common Grasshopper Warbler	Locustella naevia	5	33.33	
182	Zitting Cisticola	Cisticola juncidis	4	26.67	
183	Eurasian Blackcap	Sylvia atricapilla	9	60.00	
184	Garden Warbler	Sylvia borin	7	46.67	
185	Lesser Whitethroat	Curruca curruca	5	33.33	
186	Sardinian Warbler	Curruca melanocephala	3	20.00	
187	Western Subalpine Warbler	Curruca iberiae	2	13.33	
188	Eastern Subalpine Warbler	Curruca cantillans	1	6.67	
189	Common Whitethroat	Curruca communis	6	40.00	
190	Balearic Warbler	Curruca balearica	1	6.67	
191	Common Firecrest	Regulus ignicapilla	7	46.67	
192	Goldcrest	Regulus regulus	8	53.33	
193	Eurasian Wren	Troglodytes troglodytes	9	60.00	
194	Eurasian Nuthatch	Sitta europaea	10	66.67	
195	Wallcreeper	Tichodroma muraria	1	6.67	
196	Eurasian Treecreeper	Certhia familiaris	9	60.00	
197	Short-toed Treecreeper	Certhia brachydactyla	3	20.00	
198	Common Starling	Sturnus vulgaris	12	80.00	
199	Song Thrush	Turdus philomelos	10	66.67	
200	Mistle Thrush	Turdus viscivorus	9	60.00	
201	Redwing	Turdus iliacus	10	66.67	
202	Common Blackbird	Turdus merula	11	73.33	
203	Fieldfare	Turdus pilaris	9	60.00	
204	Ring Ouzel	Turdus torquatus	5	33.33	
205	Spotted Flycatcher	Muscicapa striata	6	40.00	
206	European Robin	Erithacus rubecula	11	73.33	
207	Common Nightingale	Luscinia megarhynchos	5	33.33	
208	Bluethroat	Luscinia svecica	4	26.67	
209	European Pied Flycatcher	Ficedula hypoleuca	5	33.33	
210	Black Redstart	Phoenicurus ochruros	5	33.33	
211	Common Redstart	Phoenicurus phoenicurus	7	46.67	
212	Common Rock Thrush	Monticola saxatilis	1	6.67	
213	Blue Rock Thrush	Monticola solitarius	3	20.00	
214	Whinchat	Saxicola rubetra	6	40.00	
215	European Stonechat	Saxicola rubicola	10	66.67	
216	Northern Wheatear	Oenanthe oenanthe	6	40.00	
217	White-throated Dipper	Cinclus cinclus	7	46.67	
218	White-winged Snowfinch	Montifringilla nivalis	2	13.33	
219	Eurasian Tree Sparrow	Passer montanus	7	46.67	
220	Italian Sparrow	Passer italiae	1	6.67	
221	House Sparrow	Passer domesticus	14	93.33	
222	Alpine Accentor	Prunella collaris	2	13.33	
223	Dunnock	Prunella modularis	11	73.33	
224	Western Yellow Wagtail	Motacilla flava	7	46.67	
225	Grey Wagtail	Motacilla cinerea	10	66.67	
226	White Wagtail	Motacilla alba	10	66.67	
227	Tawny Pipit	Anthus campestris	2	13.33	
228	Meadow Pipit	Anthus pratensis	9	60.00	
229	Tree Pipit	Anthus trivialis	6	40.00	
230	Red-throated Pipit	Anthus cervinus	1	6.67	
231	Water Pipit	Anthus spinoletta	3	20.00	
232	Eurasian Chaffinch	Fringilla coelebs	6	40.00	
233	Brambling	Fringilla montifringilla	6	40.00	
234	Hawfinch	Coccothraustes coccothraustes	6	40.00	
235	Eurasian Bullfinch	Pyrrhula pyrrhula	10	66.67	
236	Common Rosefinch	Carpodacus erythrinus	2	13.33	
237	European Greenfinch	Chloris chloris	10	66.67	
238	Common Linnet	Linaria cannabina	8	53.33	
239	Lesser Redpoll	Acanthis cabaret	5	33.33	
240	Red Crossbill	Loxia curvirostra	7	46.67	
241	European Goldfinch	Carduelis carduelis	11	73.33	
242	Citril Finch	Carduelis citrinella	1	6.67	
243	European Serin	Serinus serinus	4	26.67	
244	Eurasian Siskin	Spinus spinus	9	60.00	
245	Corn Bunting	Emberiza calandra	6	40.00	
246	Yellowhammer	Emberiza citrinella	7	46.67	
247	Rock Bunting	Emberiza cia	3	20.00	
248	Ortolan Bunting	Emberiza hortulana	2	13.33	
249	Cirl Bunting	Emberiza cirlus	6	40.00	
250	Common Reed Bunting	Emberiza schoeniclus	9	60.00