Hannes Þór Hafsteinsson: Iceland Year List 2021 IOC, All records: Top Blockers Record(s) 1 to 95 of 95 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Brent Goose	Branta bernicla	10	83.33	
2	Canada Goose	Branta canadensis	6	50.00	
3	Barnacle Goose	Branta leucopsis	11	91.67	
4	Greylag Goose	Anser anser	12	100.00	
5	Pink-footed Goose	Anser brachyrhynchus	12	100.00	
6	Greater White-fronted Goose	Anser albifrons	10	83.33	
7	Whooper Swan	Cygnus cygnus	10	83.33	
8	Common Shelduck	Tadorna tadorna	11	91.67	
9	Gadwall	Mareca strepera	12	100.00	
10	Eurasian Wigeon	Mareca penelope	12	100.00	
11	Mallard	Anas platyrhynchos	12	100.00	
12	Eurasian Teal	Anas crecca	11	91.67	
13	Green-winged Teal	Anas carolinensis	8	66.67	
14	Tufted Duck	Aythya fuligula	11	91.67	
15	Greater Scaup	Aythya marila	10	83.33	
16	Lesser Scaup	Aythya affinis	9	75.00	
17	King Eider	Somateria spectabilis	9	75.00	
18	Common Eider	Somateria mollissima	12	100.00	
19	Harlequin Duck	Histrionicus histrionicus	11	91.67	
20	Velvet Scoter	Melanitta fusca	7	58.33	
21	White-winged Scoter	Melanitta deglandi	8	66.67	
22	Long-tailed Duck	Clangula hyemalis	12	100.00	
23	Common Goldeneye	Bucephala clangula	10	83.33	
24	Common Merganser	Mergus merganser	12	100.00	
25	Red-breasted Merganser	Mergus serrator	12	100.00	
26	Rock Ptarmigan	Lagopus muta	12	100.00	
27	Rock Dove	Columba livia	10	83.33	
28	Eurasian Collared Dove	Streptopelia decaocto	7	58.33	
29	Common Moorhen	Gallinula chloropus	11	91.67	
30	Pied-billed Grebe	Podilymbus podiceps	2	16.67	
31	Horned Grebe	Podiceps auritus	9	75.00	
32	Eurasian Oystercatcher	Haematopus ostralegus	12	100.00	
33	European Golden Plover	Pluvialis apricaria	12	100.00	
34	Common Ringed Plover	Charadrius hiaticula	10	83.33	
35	Eurasian Whimbrel	Numenius phaeopus	11	91.67	
36	Eurasian Curlew	Numenius arquata	10	83.33	
37	Black-tailed Godwit	Limosa limosa	11	91.67	
38	Jack Snipe	Lymnocryptes minimus	5	41.67	
39	Eurasian Woodcock	Scolopax rusticola	10	83.33	
40	Common Snipe	Gallinago gallinago	12	100.00	
41	Common Redshank	Tringa totanus	11	91.67	
42	Ruddy Turnstone	Arenaria interpres	11	91.67	
43	Red Knot	Calidris canutus	10	83.33	
44	Sanderling	Calidris alba	10	83.33	
45	Purple Sandpiper	Calidris maritima	12	100.00	
46	Black-legged Kittiwake	Rissa tridactyla	11	91.67	
47	Black-headed Gull	Chroicocephalus ridibundus	12	100.00	
48	Common Gull	Larus canus	11	91.67	
49	European Herring Gull	Larus argentatus	11	91.67	
50	Yellow-legged Gull	Larus michahellis	2	16.67	
51	Great Black-backed Gull	Larus marinus	11	91.67	
52	Glaucous Gull	Larus hyperboreus	11	91.67	
53	Lesser Black-backed Gull	Larus fuscus	11	91.67	
54	Iceland Gull	Larus glaucoides	11	91.67	
55	Arctic Skua	Stercorarius parasiticus	11	91.67	
56	Black Guillemot	Cepphus grylle	12	100.00	
57	Little Auk	Alle alle	4	33.33	
58	Common Murre	Uria aalge	10	83.33	
59	Red-throated Diver	Gavia stellata	11	91.67	
60	Great Northern Diver	Gavia immer	10	83.33	
61	Northern Fulmar	Fulmarus glacialis	12	100.00	
62	Manx Shearwater	Puffinus puffinus	10	83.33	
63	Northern Gannet	Morus bassanus	10	83.33	
64	Great Cormorant	Phalacrocorax carbo	12	100.00	
65	European Shag	Gulosus aristotelis	12	100.00	
66	Great Egret	Ardea alba	7	58.33	
67	White-tailed Eagle	Haliaeetus albicilla	9	75.00	
68	Short-eared Owl	Asio flammeus	9	75.00	
69	Merlin	Falco columbarius	12	100.00	
70	Eurasian Hobby	Falco subbuteo	1	8.33	
71	Gyrfalcon	Falco rusticolus	12	100.00	
72	Northern Raven	Corvus corax	11	91.67	
73	Bohemian Waxwing	Bombycilla garrulus	5	41.67	
74	Goldcrest	Regulus regulus	11	91.67	
75	Eurasian Wren	Troglodytes troglodytes	10	83.33	
76	Red-breasted Nuthatch	Sitta canadensis	2	16.67	
77	Common Starling	Sturnus vulgaris	12	100.00	
78	White's Thrush	Zoothera aurea	4	33.33	
79	Song Thrush	Turdus philomelos	4	33.33	
80	Redwing	Turdus iliacus	12	100.00	
81	Common Blackbird	Turdus merula	12	100.00	
82	Fieldfare	Turdus pilaris	12	100.00	
83	European Robin	Erithacus rubecula	8	66.67	
84	Northern Wheatear	Oenanthe oenanthe	10	83.33	
85	White Wagtail	Motacilla alba	10	83.33	
86	Meadow Pipit	Anthus pratensis	10	83.33	
87	Eurasian Chaffinch	Fringilla coelebs	4	33.33	
88	Brambling	Fringilla montifringilla	7	58.33	
89	European Greenfinch	Chloris chloris	2	16.67	
90	Common Redpoll	Acanthis flammea	12	100.00	
91	Red Crossbill	Loxia curvirostra	11	91.67	
92	Eurasian Siskin	Spinus spinus	9	75.00	
93	Lapland Longspur	Calcarius lapponicus	8	66.67	
94	Snow Bunting	Plectrophenax nivalis	11	91.67	
95	Dark-eyed Junco	Junco hyemalis	2	16.67