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| Type | Common Name | [Latin Name] |
| Wagtail | - Black-backed Wagtail | [Motacilla alba lugens] |
| Wagtail | - White Wagtail - Britain | [Motacilla alba yarrelli] |
| Wagtail | - White Wagtail | [Motacilla alba alba] |
| Warbler | - Arctic Warbler | [Phylloscopus borealis] |
| Warbler | - Bay-breasted Warbler | [Dendroica castanea] |
| Warbler | - Black-and-white Warbler | [Mniotilta varia] |
| Warbler | - Blackburnian Warbler | [Dendroica fusca] |
| Warbler | - Blackpoll Warbler | [Dendroica striata] |
| Warbler | - Black-throated Blue Warbler | [Dendroica caerulescens] |
| Warbler | - Black-throated Gray Warbler | [Dendroica nigrescens] |
| Warbler | - Black-throated Green Warbler | [Dendroica virens] |
| Warbler | - Blue-winged (Brewster's) Warbler | [Vermivora pinus brewsteri] |
| Warbler | - Blue-winged Warbler | [Vermivora pinus] |
| Warbler | - Cape May Warbler | [Dendroica tigrina] |
| Warbler | - Cerulean Warbler | [Dendroica cerulea] |
| Warbler | - Chestnut-sided Warbler | [Dendroica pensylvanica] |
| Warbler | - Common Reed Warbler | [Acrocephalus scirpaceus] |
| Warbler | - Connecticut Warbler | [Oporornis agilis] |
| Warbler | - Golden-cheeked Warbler | [Dendroica chrysoparia] |
| Warbler | - Golden-winged (Lawrence's) Warbler | [Vermivora chrysoptera lawrencei] |
| Warbler | - Golden-winged Warbler | [Vermivora chrysoptera] |
| Warbler | - Hooded Warbler | [Wilsonia citrina] |
| Warbler | - Kentucky Warbler | [Oporornis formosus] |
| Warbler | - Lanceolated Warbler | [Locustella lanceolata] |
| Warbler | - MacGillivray's Warbler | [Oporornis tolmiei] |
| Warbler | - Magnolia Warbler | [Dendroica magnolia] |
| Warbler | - Mourning Warbler | [Oporornis philadelphia] |
| Warbler | - Nashville Warbler | [Vermivora ruficapilla] |
| Warbler | - Orange-crowned Warbler | [Vermivora celata] |
| Warbler | - Palm Warbler - Western | [Dendroica palmarum palmarum] |
| Warbler | - Pine Warbler | [Dendroica pinus] |
| Warbler | - Prairie Warbler | [Dendroica discolor] |
| Warbler | - Prothonotary Warbler | [Protonotaria citrea] |
| Warbler | - Sedge Warbler | [Acrocephalus schoenobaenus] |
| Warbler | - Swainson's Warbler | [Limnothlypis swainsonii] |
| Warbler | - Tennessee Warbler | [Vermivora peregrina] |
| Warbler | - Townsend's Warbler | [Dendroica townsendi] |
| Warbler | - Virginia's Warbler | [Vermivora virginiae] |
| Warbler | - Willow Warbler | [Phylloscopus trochilus] |
| Warbler | - Wilson's Warbler | [Wilsonia pusilla] |
| Warbler | - Worm-eating Warbler | [Helmitheros vermivorum] |
| Warbler | - Yellow Warbler | [Dendroica petechia] |
| Warbler | - Yellow-rumped (Audubon's) Warbler | [Dendroica coronata auduboni] |
| Warbler | - Yellow-rumped (Myrtle) Warbler | [Dendroica coronata coronata] |
| Warbler | - Yellow-throated Warbler - Eastern | [Dendroica dominica dominica] |
| Warbler | - Yellow-throated Warbler - Western | [Dendroica dominica albilora] |
| Waterthrush | - Louisiana Waterthrush | [Seiurus motacilla] |
| Waterthrush | - Northern Waterthrush | [Seiurus noveboracensis] |
| Waxwing | - Cedar Waxwing | [Bombycilla cedrorum] |
| Wheatear | - Northern Wheatear - European | [Oenanthe oenanthe oenanthe] |
| Wheatear | - Northern Wheatear - Greenland | [Oenanthe oenanthe leucorhea] |
| Whimbrel | - Whimbrel - Asian | [Numenius phaeopus variegatus] |
| Whimbrel | - Whimbrel - European | [Numenius phaeopus phaeopus] |
| Whimbrel | - Whimbrel - North American | [Numenius phaeopus hudsonicus] |
| Whistling-Duck | - Black-bellied Whistling-Duck | [Dendrocygna autumnalis] |
| Whistling-Duck | - Fulvous Whistling-Duck | [Dendrocygna bicolor] |
| Wigeon | - American Wigeon | [Anas americana] |
| Wigeon | - Eurasian Wigeon | [Anas penelope] |
| Willet | - Willet - Eastern | [Tringa semipalmata semipalmata] |
| Willet | - Willet - Western | [Tringa semipalmata inornata] |
| Wood-Pewee | - Eastern Wood-Pewee | [Contopus virens] |
| Wood-Pewee | - Western Wood-Pewee | [Contopus sordidulus] |
| Woodpecker | - Acorn Woodpecker | [Melanerpes formicivorus] |
| Woodpecker | - American Three-toed Woodpecker - Rockies | [Picoides dorsalis dorsalis] |
| Woodpecker | - American Three-toed Woodpecker - Western | [Picoides dorsalis fasciatus] |
| Woodpecker | - Arizona Woodpecker | [Picoides arizonae] |
| Woodpecker | - Black-backed Woodpecker | [Picoides arcticus] |
| Woodpecker | - Downy Woodpecker | [Picoides pubescens] |
| Woodpecker | - Gila Woodpecker | [Melanerpes uropygialis] |
| Woodpecker | - Golden-fronted Woodpecker | [Melanerpes aurifrons] |
| Woodpecker | - Great Spotted Woodpecker | [Dendrocopus major] |
| Woodpecker | - Hairy Woodpecker - Eastern | [Picoides villosus villosus] |
| Woodpecker | - Hairy Woodpecker - Western | [Picoides villosus ??] |
| Woodpecker | - Japanese Pygmy Woodpecker | [Dendrocopus kizuki] |
| Woodpecker | - Ladder-backed Woodpecker | [Picoides scalaris] |
| Woodpecker | - Lewis's Woodpecker | [Melanerpes lewis] |
| Woodpecker | - Nuttall's Woodpecker | [Picoides nuttallii] |
| Woodpecker | - Pileated Woodpecker | [Dryocopus pileatus] |
| Woodpecker | - Red-bellied Woodpecker | [Melanerpes carolinus] |
| Woodpecker | - Red-cockaded Woodpecker | [Picoides borealis] |
| Woodpecker | - Red-headed Woodpecker | [Melanerpes erythrocephalus] |
| Wren | - Bewick's Wren - California | [Thryomanes bewickii ??] |
| Wren | - Bewick's Wren - Texas | [Thryomanes bewickii cryptus] |
| Wren | - Cactus Wren | [Campylorhynchus brunneicapillus] |
| Wren | - Canyon Wren | [Catherpes mexicanus] |
| Wren | - Carolina Wren - Mexican | [Thryothorus ludovicianus lomitensis] |
| Wren | - Carolina Wren - Northern | [Thryothorus ludovicianus ludovicianus] |
| Wren | - House Wren - Eastern | [Troglodytes aedon aedon] |
| Wren | - House Wren - Western | [Troglodytes aedon parkmannii] |
| Wren | - Marsh Wren | [Cistothorus palustris] |
| Wren | - Rock Wren | [Salpinctes obsoletus] |
| Wren | - Sedge Wren | [Cistothorus platensis] |
| Wren | - Winter Wren - Eastern | [Troglodytes troglodytes hiemalis] |
| Wren | - Winter Wren - Eurasian | [Troglodytes troglodytes troglodytes] |
| Wren | - Winter Wren - Shetland | [Troglodytes troglodytes ??] |
| Wrentit | - Wrentit | [Chamaea fasciata] |