Western Gull - Larus occidentalis

Black-bellied Whistling-Duck1
Fulvous Whistling-Duck2
Brant (Atlantic)6007
Brant (Black)6008
Brant6
Cackling Goose (Aleutian)6012
Cackling Goose (Ridgway's)6015
Cackling Goose7
Canada Goose (Dusky)6016
Trumpeter Swan9
Tundra Swan10
Garganey21
American Black Duck x Mallard5001
Mexican Duck6000
Eurasian Wigeon13
American Black Duck15
Mottled Duck498
Tufted Duck26
Harlequin Duck29
Surf Scoter30
Black Scoter32
Long-tailed Duck33
California Quail506
Ruffed Grouse46
Dusky Grouse50
Horned Grebe61
Red-necked Grebe62
Band-tailed Pigeon198
Eurasian Collared-Dove199
Inca Dove202
Common Ground-Dove203
White-winged Dove200
Black-billed Cuckoo205
Greater Roadrunner206
Groove-billed Ani207
Lesser Nighthawk222
Eastern Whip-poor-will225
Mexican Whip-poor-will226
Black Swift227
Chimney Swift228
Vaux's Swift502
Mexican Violetear230
Rivoli’s Hummingbird231
Blue-throated Hummingbird232
Ruby-throated Hummingbird233
White-faced X Glossy Ibis5000
Black-chinned Hummingbird234
Anna's Hummingbird235
Costa's Hummingbird236
Calliope Hummingbird239
Broad-billed Hummingbird240
White-eared Hummingbird241
Yellow Rail109
Black Rail110
King Rail111
Purple Gallinule114
Common Gallinule115
Sandhill Crane117
Red-tailed Hawk (Krider's)6001
Whooping Crane118
American Golden-Plover120
Snowy Plover121
Piping Plover123
Mountain Plover125
Upland Sandpiper133
Whimbrel135
Eskimo Curlew134
Hudsonian Godwit137
Ruddy Turnstone139
Red Knot140
Ruff153
Sharp-tailed Sandpiper148
Curlew Sandpiper150
Purple Sandpiper505
Baird's Sandpiper146
Least Sandpiper144
White-rumped Sandpiper145
Buff-breasted Sandpiper152
Pectoral Sandpiper147
Short-billed Dowitcher154
American Woodcock157
Red-necked Phalarope159
Red Phalarope160
Pomarine Jaeger192
Parasitic Jaeger193
Long-tailed Jaeger194
Long-billed Murrelet195
Ancient Murrelet196
Black-legged Kittiwake161
Ivory Gull162
Sabine's Gull163
Black-headed Gull165
Little Gull166
Ross's Gull167
Laughing Gull168
Jaeger sp.4001
Mew Gull170
Western Gull172
Herring Gull174
Iceland Gull176
Lesser Black-backed Gull177
Slaty-backed Gull178
Glaucous-winged Gull179
Great Black-backed Gull181
Kelp Gull182
Sooty Tern183
Least Tern184
Caspian Tern185
Arctic Tern188
Royal Tern190
Glaucous-winged Gull hybrid5005
Sandwich Tern496
Black Skimmer191
Red-throated Loon55
Arctic Loon56
Pacific Loon57
Yellow-billed Loon59
Wood Stork66
Magnificent Frigatebird67
Brown Booby504
Neotropic Cormorant68
Anhinga70
Brown Pelican72
Least Bittern74
Great Egret76
Little Blue Heron78
Tricolored Heron79
Reddish Egret80
Cattle Egret81
Yellow-crowned Night-Heron84
White Ibis85
Glossy Ibis86
Roseate Spoonbill88
Black Vulture89
Osprey91
Swallow-tailed Kite92
Mississippi Kite94
Common Black Hawk100
Whip-poor-will sp.4003
Harris's Hawk101
Red-shouldered Hawk102
Broad-winged Hawk103
Zone-tailed Hawk105
Rough-legged Hawk108
Snowy Owl213
Spotted Owl216
Barred Owl217
Boreal Owl220
Northern Saw-whet Owl221
Red-headed Woodpecker244
Acorn Woodpecker245
Red-bellied Woodpecker246
Williamson's Sapsucker247
Yellow-bellied Sapsucker248
Red-naped Sapsucker249
Red-breasted Sapsucker507
Merlin (Black)6014
Ladder-backed Woodpecker250
Crested Caracara255
Merlin257
Gyrfalcon258
Olive-sided Flycatcher261
Eastern Wood-Pewee263
Yellow-bellied Flycatcher264
Acadian Flycatcher265
Alder Flycatcher266
Least Flycatcher268
Hammond's Flycatcher269
Gray Flycatcher270
Buff-breasted Flycatcher273
Black Phoebe274
Eastern Phoebe275
Vermilion Flycatcher277
Dusky-capped Flycatcher278
Great Crested Flycatcher280
Brown-crested Flycatcher281
Great Kiskadee495
Sulphur-bellied Flycatcher282
Tropical Kingbird508
Couch's Kingbird503
Thick-billed Kingbird284
Eastern Kingbird286
Scissor-tailed Flycatcher287
Fork-tailed Flycatcher511
White-eyed Vireo290
Bell's Vireo291
Gray Vireo292
Yellow-throated Vireo293
Blue-headed Vireo296
Philadelphia Vireo298
Woodhouse's Scrub-Jay304
Clark's Nutcracker306
Chihuahuan Raven308
Purple Martin312
Tree Swallow313
Cave Swallow499
Juniper Titmouse320
Pacific Wren330
Winter Wren331
Sedge Wren332
Carolina Wren334
Bewick's Wren335
Cactus Wren509
Swainson's Thrush (Russet-backed)6005
Eastern Bluebird340
Gray-cheeked Thrush345
Hermit Thrush347
Wood Thrush348
Varied Thrush350
Gray Catbird351
Curve-billed Thrasher357
Brown Thrasher354
Long-billed Thrasher355
Bendire's Thrasher356
Northern Mockingbird352
Phainopepla363
Sprague's Pipit360
Brewster's Warbler5002
Brambling478
Black Rosy-Finch480
Purple Finch483
Common Redpoll488
Hoary Redpoll497
Red Crossbill486
White-winged Crossbill487
Lawrence's Goldfinch491
Chestnut-collared Longspur365
Smith's Longspur366
McCown's Longspur367
Snow Bunting368
Eastern Towhee418
Canyon Towhee420
Cassin's Sparrow421
Chipping Sparrow423
Clay-colored Sparrow424
Field Sparrow426
Black-chinned Sparrow427
Black-throated Sparrow430
Sagebrush Sparrow431
Savannah Sparrow433
Grasshopper Sparrow434
Baird's Sparrow435
Henslow's Sparrow436
LeConte's Sparrow437
Nelson's Sparrow438
White-throated Sparrow443
Golden-crowned Sparrow446
Bobolink461
Eastern Meadowlark463
Orchard Oriole472
Hooded Oriole473
Streak-backed Oriole474
Bullock's Oriole475
Baltimore Oriole476
Scott's Oriole477
Bronzed Cowbird470
Fox Sparrow (Red)6002
Fox Sparrow (Slate-colored)6003
Great-tailed Grackle469
Ovenbird369
Worm-eating Warbler370
Louisiana Waterthrush371
Northern Waterthrush372
Golden-winged Warbler374
Blue-winged Warbler373
Black-and-white Warbler375
Prothonotary Warbler376
Swainson's Warbler377
Tennessee Warbler378
Lucy's Warbler380
Virginia's Warbler382
Connecticut Warbler383
Mourning Warbler385
Kentucky Warbler386
Hooded Warbler388
Cape May Warbler390
Cerulean Warbler391
Northern Parula392
Tropical Parula393
Magnolia Warbler394
Bay-breasted Warbler395
Blackburnian Warbler396
Chestnut-sided Warbler398
Bullocks x Baltimore Oriole5003
Blackpoll Warbler399
Black-throated Blue Warbler400
Palm Warbler401
Pine Warbler402
Yellow-throated Warbler404
Prairie Warbler405
Grace's Warbler406
Hermit Warbler409
Golden-crowned Warbler510
Canada Warbler411
Redpoll sp.4004
Red-faced Warbler413
Painted Redstart414
Hepatic Tanager448
Summer Tanager449
Scarlet Tanager450
Northern Cardinal452
Pyrrhuloxia453
Rose-breasted Grosbeak454
Indigo Bunting458
Painted Bunting459
Dickcissel460

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Accession No.

Year

Date(s)

County

Location

Observers

Photos

Audio

Photo


2011-81 2011-81	2011	6/1/2011 - 6/18/2011	Douglas & Arapahoe	Chatfield Reservoir	Glenn Walbek, David Alcock, Peter Gent, Bill Maynard, Brandon Percival, Nathan Pieplow	Yes	No	True

2012-28 2012-28	2012	3/17/2012	Morgan	Prewitt Res.	Steve Mlodinow	Yes	No	True

2012-38 2012-38	2012	3/29/2012	Washington	CO-6 pond near Prewitt Res	Steve Mlodinow	Yes	No	True

2013-239 2013-239	2013	10/05/2013	Larimer	Timnath Reservoir	Steven Mlodinow	No	No	False

2014-171 2014-171	2014	11/30/2014	El Paso	Big Johnson Reservoir	John Drummond	No	No	False

2016-054 2016-054	2016	07/20/2016	Alamosa	Blanca Wetlands	Sam Fason	Yes	No	False

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