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