Bennet Porter: World Year List 2020 Clements, All records: Top Blockers Record(s) 1 to 177 of 177 total.
Seq.	Species	Scientific Name	Seen By Other Listers	Other Listers (%)	
1	Black-bellied Whistling-Duck	Dendrocygna autumnalis	2	66.67	
2	Brant	Branta bernicla	1	33.33	
3	Canada Goose	Branta canadensis	2	66.67	
4	Mute Swan	Cygnus olor	2	66.67	
5	Wood Duck	Aix sponsa	2	66.67	
6	Blue-winged Teal	Spatula discors	2	66.67	
7	Gadwall	Mareca strepera	2	66.67	
8	American Wigeon	Mareca americana	2	66.67	
9	Mallard	Anas platyrhynchos	2	66.67	
10	American Black Duck	Anas rubripes	2	66.67	
11	Mottled Duck	Anas fulvigula	1	33.33	
12	Green-winged Teal	Anas crecca	2	66.67	
13	Ring-necked Duck	Aythya collaris	2	66.67	
14	Lesser Scaup	Aythya affinis	2	66.67	
15	Common Eider	Somateria mollissima	1	33.33	
16	White-winged Scoter	Melanitta deglandi	2	66.67	
17	Long-tailed Duck	Clangula hyemalis	2	66.67	
18	Bufflehead	Bucephala albeola	2	66.67	
19	Common Goldeneye	Bucephala clangula	2	66.67	
20	Hooded Merganser	Lophodytes cucullatus	2	66.67	
21	Red-breasted Merganser	Mergus serrator	2	66.67	
22	Wild Turkey	Meleagris gallopavo	2	66.67	
23	American Flamingo	Phoenicopterus ruber	1	33.33	
24	Pied-billed Grebe	Podilymbus podiceps	2	66.67	
25	Red-necked Grebe	Podiceps grisegena	2	66.67	
26	Rock Pigeon	Columba livia	2	66.67	
27	White-crowned Pigeon	Patagioenas leucocephala	1	33.33	
28	Eurasian Collared-Dove	Streptopelia decaocto	2	66.67	
29	Mourning Dove	Zenaida macroura	2	66.67	
30	Squirrel Cuckoo	Piaya cayana	1	33.33	
31	Common Cuckoo	Cuculus canorus	1	33.33	
32	Chimney Swift	Chaetura pelagica	2	66.67	
33	Green-breasted Mango	Anthracothorax prevostii	1	33.33	
34	Ruby-throated Hummingbird	Archilochus colubris	2	66.67	
35	Cozumel Emerald	Cynanthus forficatus	1	33.33	
36	Canivet's Emerald	Cynanthus canivetii	1	33.33	
37	Common Gallinule	Gallinula galeata	2	66.67	
38	Purple Gallinule	Porphyrio martinica	2	66.67	
39	Sandhill Crane	Antigone canadensis	2	66.67	
40	Black-necked Stilt	Himantopus mexicanus	2	66.67	
41	American Avocet	Recurvirostra americana	1	33.33	
42	American Oystercatcher	Haematopus palliatus	1	33.33	
43	Black-bellied Plover	Pluvialis squatarola	2	66.67	
44	Killdeer	Charadrius vociferus	2	66.67	
45	Semipalmated Plover	Charadrius semipalmatus	2	66.67	
46	Northern Jacana	Jacana spinosa	1	33.33	
47	American Woodcock	Scolopax minor	2	66.67	
48	Lesser Yellowlegs	Tringa flavipes	2	66.67	
49	Willet	Tringa semipalmata	2	66.67	
50	Greater Yellowlegs	Tringa melanoleuca	2	66.67	
51	Sanderling	Calidris alba	2	66.67	
52	Pectoral Sandpiper	Calidris melanotos	2	66.67	
53	Semipalmated Sandpiper	Calidris pusilla	2	66.67	
54	Laughing Gull	Leucophaeus atricilla	1	33.33	
55	Ring-billed Gull	Larus delawarensis	2	66.67	
56	Herring Gull	Larus argentatus	2	66.67	
57	Great Black-backed Gull	Larus marinus	2	66.67	
58	Lesser Black-backed Gull	Larus fuscus	2	66.67	
59	Forster's Tern	Sterna forsteri	2	66.67	
60	Common Tern	Sterna hirundo	2	66.67	
61	Royal Tern	Thalasseus maximus	1	33.33	
62	Common Loon	Gavia immer	2	66.67	
63	Wood Stork	Mycteria americana	2	66.67	
64	Magnificent Frigatebird	Fregata magnificens	1	33.33	
65	Northern Gannet	Morus bassanus	1	33.33	
66	Brown Booby	Sula leucogaster	1	33.33	
67	Anhinga	Anhinga anhinga	1	33.33	
68	Great Cormorant	Phalacrocorax carbo	1	33.33	
69	Double-crested Cormorant	Nannopterum auritum	2	66.67	
70	Brown Pelican	Pelecanus occidentalis	1	33.33	
71	Yellow-crowned Night Heron	Nyctanassa violacea	1	33.33	
72	Little Blue Heron	Egretta caerulea	1	33.33	
73	Tricolored Heron	Egretta tricolor	1	33.33	
74	Snowy Egret	Egretta thula	2	66.67	
75	Green Heron	Butorides virescens	2	66.67	
76	Western Cattle Egret	Bubulcus ibis	1	33.33	
77	Great Egret	Ardea alba	3	100.00	
78	Great Blue Heron	Ardea herodias	2	66.67	
79	White Ibis	Eudocimus albus	1	33.33	
80	Roseate Spoonbill	Platalea ajaja	1	33.33	
81	Black Vulture	Coragyps atratus	1	33.33	
82	Turkey Vulture	Cathartes aura	2	66.67	
83	Osprey	Pandion haliaetus	3	100.00	
84	Northern Harrier	Circus hudsonius	2	66.67	
85	Cooper's Hawk	Accipiter cooperii	2	66.67	
86	Red-tailed Hawk	Buteo jamaicensis	2	66.67	
87	Great Horned Owl	Bubo virginianus	2	66.67	
88	Ringed Kingfisher	Megaceryle torquata	1	33.33	
89	Belted Kingfisher	Megaceryle alcyon	2	66.67	
90	Green Kingfisher	Chloroceryle americana	1	33.33	
91	Golden-fronted Woodpecker	Melanerpes aurifrons	1	33.33	
92	Red-bellied Woodpecker	Melanerpes carolinus	2	66.67	
93	Downy Woodpecker	Dryobates pubescens	2	66.67	
94	Hairy Woodpecker	Dryobates villosus	2	66.67	
95	Northern Flicker	Colaptes auratus	2	66.67	
96	Nanday Parakeet	Aratinga nenday	1	33.33	
97	Masked Tityra	Tityra semifasciata	1	33.33	
98	Eastern Wood-Pewee	Contopus virens	2	66.67	
99	Acadian Flycatcher	Empidonax virescens	2	66.67	
100	Willow Flycatcher	Empidonax traillii	2	66.67	
101	Least Flycatcher	Empidonax minimus	2	66.67	
102	Eastern Phoebe	Sayornis phoebe	2	66.67	
103	Great Crested Flycatcher	Myiarchus crinitus	2	66.67	
104	Brown-crested Flycatcher	Myiarchus tyrannulus	1	33.33	
105	Boat-billed Flycatcher	Megarynchus pitangua	1	33.33	
106	Social Flycatcher	Myiozetetes similis	1	33.33	
107	Western Kingbird	Tyrannus verticalis	2	66.67	
108	Eastern Kingbird	Tyrannus tyrannus	2	66.67	
109	White-eyed Vireo	Vireo griseus	2	66.67	
110	Blue-headed Vireo	Vireo solitarius	2	66.67	
111	Warbling Vireo	Vireo gilvus	2	66.67	
112	Red-eyed Vireo	Vireo olivaceus	2	66.67	
113	Yucatan Vireo	Vireo magister	1	33.33	
114	Loggerhead Shrike	Lanius ludovicianus	2	66.67	
115	Blue Jay	Cyanocitta cristata	2	66.67	
116	American Crow	Corvus brachyrhynchos	2	66.67	
117	Fish Crow	Corvus ossifragus	1	33.33	
118	Carolina Chickadee	Poecile carolinensis	1	33.33	
119	Black-capped Chickadee	Poecile atricapillus	2	66.67	
120	Tufted Titmouse	Baeolophus bicolor	2	66.67	
121	Tree Swallow	Tachycineta bicolor	2	66.67	
122	Mangrove Swallow	Tachycineta albilinea	1	33.33	
123	Purple Martin	Progne subis	2	66.67	
124	Barn Swallow	Hirundo rustica	3	100.00	
125	Ruby-crowned Kinglet	Corthylio calendula	2	66.67	
126	Golden-crowned Kinglet	Regulus satrapa	2	66.67	
127	White-breasted Nuthatch	Sitta carolinensis	2	66.67	
128	Red-breasted Nuthatch	Sitta canadensis	2	66.67	
129	Brown Creeper	Certhia americana	2	66.67	
130	Blue-Gray Gnatcatcher	Polioptila caerulea	2	66.67	
131	House Wren	Troglodytes aedon	2	66.67	
132	Carolina Wren	Thryothorus ludovicianus	2	66.67	
133	European Starling	Sturnus vulgaris	2	66.67	
134	Gray Catbird	Dumetella carolinensis	2	66.67	
135	Tropical Mockingbird	Mimus gilvus	1	33.33	
136	Northern Mockingbird	Mimus polyglottos	2	66.67	
137	Eastern Bluebird	Sialia sialis	2	66.67	
138	American Robin	Turdus migratorius	2	66.67	
139	Cedar Waxwing	Bombycilla cedrorum	2	66.67	
140	House Sparrow	Passer domesticus	3	100.00	
141	American Pipit	Anthus rubescens	2	66.67	
142	House Finch	Haemorhous mexicanus	2	66.67	
143	Purple Finch	Haemorhous purpureus	2	66.67	
144	Pine Siskin	Spinus pinus	2	66.67	
145	American Goldfinch	Spinus tristis	2	66.67	
146	Chipping Sparrow	Spizella passerina	2	66.67	
147	Dark-eyed Junco	Junco hyemalis	2	66.67	
148	White-throated Sparrow	Zonotrichia albicollis	2	66.67	
149	Song Sparrow	Melospiza melodia	2	66.67	
150	Eastern Towhee	Pipilo erythrophthalmus	2	66.67	
151	Orchard Oriole	Icterus spurius	2	66.67	
152	Baltimore Oriole	Icterus galbula	2	66.67	
153	Red-winged Blackbird	Agelaius phoeniceus	2	66.67	
154	Brown-headed Cowbird	Molothrus ater	2	66.67	
155	Common Grackle	Quiscalus quiscula	2	66.67	
156	Boat-tailed Grackle	Quiscalus major	1	33.33	
157	Great-tailed Grackle	Quiscalus mexicanus	1	33.33	
158	Ovenbird	Seiurus aurocapilla	2	66.67	
159	Black-and-white Warbler	Mniotilta varia	2	66.67	
160	Orange-crowned Warbler	Leiothlypis celata	2	66.67	
161	Common Yellowthroat	Geothlypis trichas	2	66.67	
162	Hooded Warbler	Setophaga citrina	2	66.67	
163	American Redstart	Setophaga ruticilla	2	66.67	
164	Northern Parula	Setophaga americana	2	66.67	
165	Magnolia Warbler	Setophaga magnolia	2	66.67	
166	Yellow Warbler	Setophaga petechia	2	66.67	
167	Black-throated Blue Warbler	Setophaga caerulescens	2	66.67	
168	Palm Warbler	Setophaga palmarum	2	66.67	
169	Pine Warbler	Setophaga pinus	2	66.67	
170	Yellow-rumped Warbler	Setophaga coronata	2	66.67	
171	Prairie Warbler	Setophaga discolor	2	66.67	
172	Black-throated Green Warbler	Setophaga virens	2	66.67	
173	Western Tanager	Piranga ludoviciana	1	33.33	
174	Northern Cardinal	Cardinalis cardinalis	2	66.67	
175	Indigo Bunting	Passerina cyanea	2	66.67	
176	Morelet's Seedeater	Sporophila morelleti	1	33.33	
177	Bananaquit	Coereba flaveola	1	33.33