The full hybrid index was compiled mostly using eBird and Avian Hybrids. Some hybrids listed by these sources don’t have photos or information online that I was able to track down, which is why some of these taxa don’t have individual sections in the guide dedicated to them. Contributions for these taxa especially are extremely helpful, but information on nearly all hybrids is lacking so any information or media is important. If you notice any errors or have something to contribute please leave a comment or send me a message.
Compiling a list of all known hybrids with examples is difficult for several reasons. Obviously I'm not able to obtain permission to embed all media of these hybrids on a single web page/journal post. This means I'm relying on countless other sites to continue to host said media for the foreseeable future. This will inevitably lead to broken links and lost media. Uploading to sites like iNat and eBird can hopefully prevent this.
Ovenbird (Seiurus aurocapilla )
Worm-eating Warbler(Helmitheros vermivorum)
Louisiana Waterthrush(Parkesia motacilla)
Northern Waterthrush(Parkesia noveboracensis)
Golden-winged Warbler(Vermivora chrysoptera)
Golden-winged x Blue-winged Warbler Blue-winged x Golden-winged Warbler Blue-winged x Kentucky Warbler
Blue-winged Warbler(Vermivora cyanoptera)
Blue-winged x Cerulean Warbler
Black-and-white Warbler(Mniotilta varia)
Black-and-white x Cerulean Warbler
Black-and-white x Blackburnian Warbler
Black-and-white x Yellow-rumped Warbler
Prothonotary Warbler(Protonotaria citrea)
Swainson's Warbler(Limnothlypis swainsonii)
Crescent-chested Warbler(Oreothlypis superciliosa)
Flame-throated Warbler(Oreothlypis gutturalis)
Tennessee Warbler(Leiothlypis peregrina)
Tennessee x Nashville Warbler Orange-crowned x Nashville Warbler Colima x Virginia's Warbler Nashville x Tennessee Warbler Nashville x Orange-crowned Warbler Nashville x Magnolia Warbler Virginia's x Colima Warbler
Orange-crowned Warbler(Leiothlypis celata)
Colima Warbler(Leiothlypis crissalis)
Lucy's Warbler(Leiothlypis luciae)
Nashville Warbler(Leiothlypis ruficapilla)
Virginia's Warbler(Leiothlypis virginiae)
Connecticut Warbler(Oporornis agilis)
Connecticut x Mourning Warbler
Gray-crowned Yellowthroat(Geothlypis poliocephala)
Gray-crowned x Common Yellowthroat MacGillivray's x Mourning Warbler MacGillivray's Warbler x Common Yellowthroat
Masked Yellowthroat(Geothlypis aequinoctialis)
Black-lored Yellowthroat(Geothlypis auricularis)
Southern Yellowthroat(Geothlypis velata)
MacGillivray's Warbler(Geothlypis tolmiei)
Mourning Warbler(Geothlypis philadelphia)
Mourning x Connecticut Warbler
Mourning x MacGillivray's Warbler Mourning x Kentucky Warbler Mourning Warbler x Common Yellowthroat Kentucky x Blue-winged Warbler Kentucky x Mourning Warbler Kentucky Warbler x Common Yellowthroat Common x Gray-crowned Yellowthroat Common Yellowthroat x MacGillivray's Warbler Common Yellowthroat x Mourning Warbler Common Yellowthroat x Kentucky Warbler
Kentucky Warbler(Geothlypis formosa)
Olive-crowned Yellowthroat(Geothlypis semiflava)
Black-polled Yellowthroat(Geothlypis speciosa)
Belding's Yellowthroat(Geothlypis beldingi)
Bahama Yellowthroat(Geothlypis rostrata)
Altamira Yellowthroat(Geothlypis flavovelata)
Common Yellowthroat(Geothlypis trichas)
Common Yellowthroat x Yellow Warbler
Common Yellowthroat x Rufous-capped Warbler
Hooded Yellowthroat(Geothlypis nelsoni)
Whistling Warbler(Catharopeza bishopi)
Plumbeous Warbler(Setophaga plumbea)
Hooded x Yellow Warbler American Redstart x Northern Parula American Redstart x Magnolia Warbler American Redstart x Yellow Warbler Kirtland's x Blackburnian Warbler
Elfin-woods Warbler(Setophaga angelae)
Arrowhead Warbler(Setophaga pharetra)
Hooded Warbler(Setophaga citrina)
American Redstart(Setophaga ruticilla)
Kirtland's Warbler(Setophaga kirtlandii)
Cape May Warbler(Setophaga tigrina)
Cape May x Magnolia Warbler
Cape May x Yellow-rumped Warbler
Cerulean x Blue-winged Warbler
Cerulean x Black-and-white Warbler Cerulean Warbler x Northern Parula Cerulean x Black-throated Blue Warbler Northern Parula x American Redstart Northern Parula x Cerulean Warbler Northern x Tropical Parula Northern Parula x Yellow-throated Warbler Tropical x Northern Parula Magnolia x Nashville Warbler Magnolia Warbler x American Redstart Magnolia x Chestnut-sided Warbler Magnolia x Black-throated Blue Warbler Magnolia x Palm Warbler Magnolia x Yellow-rumped Warbler Bay-breasted x Blackburnian Warbler Bay-breasted x Blackpoll Warbler
Northern Parula(Setophaga americana)
Tropical Parula(Setophaga pitiayumi)
Magnolia Warbler(Setophaga magnolia)
Bay-breasted Warbler(Setophaga castanea)
Blackburnian Warbler(Setophaga fusca)
Blackburnian x Black-and-white Warbler
Blackburnian x Kirtland's Warbler Blackburnian x Bay-breasted Warbler
Yellow Warbler(Setophaga petechia)
Yellow Warbler x Common Yellowthroat
Yellow x Hooded Warbler Yellow Warbler x American Redstart Yellow x Black-throated Blue Warbler Yellow x Prairie Warbler Chestnut-sided x Magnolia Warbler Chestnut-sided x Black-throated Blue Warbler Blackpoll x Bay-breasted Warbler Black-throated Blue x Cerulean Warbler Black-throated Blue x Magnolia Warbler Black-throated Blue x Yellow Warbler Black-throated Blue x Chestnut-sided Warbler Palm x Magnolia Warbler Palm x Yellow-rumped Warbler Pine x Yellow-throated Warbler Yellow-rumped x Black-and-white Warbler Yellow-rumped x Cape May Warbler Yellow-rumped x Magnolia Warbler Yellow-rumped x Palm Warbler Yellow-rumped x Yellow-throated Warbler Yellow-rumped x Grace's Warbler
Chestnut-sided Warbler(Setophaga pensylvanica)
Blackpoll Warbler(Setophaga striata)
Black-throated Blue Warbler(Setophaga caerulescens)
Palm Warbler(Setophaga palmarum)
Olive-capped Warbler(Setophaga pityophila)
Pine Warbler(Setophaga pinus)
Yellow-rumped Warbler(Setophaga coronata)
Yellow-rumped x Black-throated Gray Warbler
Yellow-rumped x Townsend's Warbler Yellow-rumped x Hermit Warbler Yellow-rumped x Black-throated Green Warbler Yellow-throated Warbler x Northern Parula Yellow-throated x Pine Warbler Yellow-throated x Yellow-rumped Warbler Prairie x Blue-winged Warbler Prairie x Yellow Warbler Grace's x Yellow-rumped Warbler Grace's x Black-throated Gray Warbler Black-throated Gray x Grace's Warbler Black-throated Gray x Townsend's Warbler Black-throated Gray x Hermit Warbler Townsend's x Yellow-rumped Warbler Townsend's x Black-throated Gray Warbler Townsend's x Hermit Warbler Townsend's x Black-throated Green Warbler Hermit x Yellow-rumped Warbler Hermit x Black-throated Gray Warbler Hermit x Townsend's Warbler Black-throated Green x Yellow-rumped Warbler Black-throated Green x Townsend's Warbler
Yellow-throated Warbler(Setophaga dominica)
Bahama Warbler(Setophaga flavescens)
Vitelline Warbler(Setophaga vitellina)
Prairie Warbler(Setophaga discolor)
Adelaide's Warbler(Setophaga adelaidae)
Barbuda Warbler(Setophaga subita)
St. Lucia Warbler(Setophaga delicata)
Grace's Warbler(Setophaga graciae)
Black-throated Gray Warbler(Setophaga nigrescens)
Townsend's Warbler(Setophaga townsendi)
Hermit Warbler(Setophaga occidentalis)
Golden-cheeked Warbler(Setophaga chrysoparia)
Black-throated Green Warbler(Setophaga virens)
Fan-tailed Warbler(Basileuterus lachrymosus)
Rufous-capped Warbler x Common Yellowthroat Golden-crowned x Flavescent Warbler
Rufous-capped Warbler(Basileuterus rufifrons)
Chestnut-capped Warbler(Basileuterus delattrii)
Black-cheeked Warbler(Basileuterus melanogenys)
Pirre Warbler(Basileuterus ignotus)
Golden-browed Warbler(Basileuterus belli)
Golden-crowned Warbler(Basileuterus culicivorus)
Costa Rican Warbler(Basileuterus melanotis)
Tacarcuna Warbler(Basileuterus tacarcunae)
Three-striped Warbler(Basileuterus tristriatus)
Yungas Warbler(Basileuterus punctipectus)
Three-banded Warbler(Basileuterus trifasciatus)
Gray-headed Warbler(Myiothlypis griseiceps)
Flavescent x Golden-crowned Warbler
Santa Marta Warbler(Myiothlypis basilica)
Citrine Warbler(Myiothlypis luteoviridis)
White-striped Warbler(Myiothlypis leucophrys)
Flavescent Warbler(Myiothlypis flaveola)
White-browed Warbler(Myiothlypis leucoblephara)
Pale-legged Warbler(Myiothlypis signata)
Black-crested Warbler(Myiothlypis nigrocristata)
Buff-rumped Warbler(Myiothlypis fulvicauda)
Riverbank Warbler(Myiothlypis rivularis)
Two-banded Warble(Myiothlypis bivittata)
Cuzco Warbler(Myiothlypis chrysogaster)
Choco Warbler(Myiothlypis chlorophrys)
Gray-throated Warbler(Myiothlypis cinereicollis)
White-lored Warbler(Myiothlypis conspicillata)
Gray-and-gold Warbler(Myiothlypis fraseri)
Russet-crowned Warbler(Myiothlypis coronata)
Canada Warbler(Cardellina canadensis)
Wilson's Warbler(Cardellina pusilla)
Red-faced Warbler(Cardellina rubrifrons)
Red Warbler(Cardellina rubra)
Pink-headed Warbler(Cardellina versicolor)
Painted Redstart (Myioborus pictus)
Painted x Slate-throated Redstart
Slate-throated Redstart (Myioborus miniatus)
Slate-throated x Painted Redstart
Brown-capped Redstart(Myioborus brunniceps)
Golden-fronted x Spectacled Redstart Spectacled x Golden-fronted Redstart
Tepui Redstart(Myioborus castaneocapilla)
Paria Redstart(Myioborus pariae)
Saffron-breasted Redstart(Myioborus cardonai)
White-faced Redstart(Myioborus albifacies)
Collared Redstart(Myioborus torquatus)
Yellow-crowned Redstart(Myioborus flavivertex)
Golden-fronted Redstart(Myioborus ornatus)
Spectacled Redstart(Myioborus melanocephalus)
White-fronted Redstart(Myioborus albifrons)
Brewster's x Chestnut-sided Warbler
eBird
eBird (Brewster's)
eBird (Lawrence's)
iNat
Probably the most well-studied Parulid hybrid. Plenty of info online.
https://macaulaylibrary.org/asset/165160151
https://macaulaylibrary.org/asset/358764431
https://macaulaylibrary.org/asset/28595451
https://macaulaylibrary.org/asset/549927071 (Lawrence's)
https://macaulaylibrary.org/asset/459278441 (Brewster's)
Note: Certain traits such as yellow wing bars can persist through introgression long after any hybridization and in many cases don't necessarily indicate recent hybridization: https://sora.unm.edu/sites/default/files/journals/auk/v097n01/p0001-p0018.pdf
Other names: Schain's Warbler
https://macaulaylibrary.org/asset/40930401
https://macaulaylibrary.org/asset/40930371
https://macaulaylibrary.org/asset/20218731
https://macaulaylibrary.org/asset/20218761
https://macaulaylibrary.org/asset/465815231
https://macaulaylibrary.org/asset/465815241
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https://macaulaylibrary.org/asset/343340191
https://macaulaylibrary.org/asset/448143401
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https://macaulaylibrary.org/asset/582208831
https://macaulaylibrary.org/asset/582199891
https://macaulaylibrary.org/asset/582207901
https://macaulaylibrary.org/asset/452767421
https://macaulaylibrary.org/asset/456963031
https://macaulaylibrary.org/asset/20123141
https://macaulaylibrary.org/asset/30914131
https://macaulaylibrary.org/asset/20123151
https://macaulaylibrary.org/asset/132261031
https://macaulaylibrary.org/asset/173043711
https://macaulaylibrary.org/asset/137063701
https://macaulaylibrary.org/asset/566197221
https://macaulaylibrary.org/asset/566197211
https://macaulaylibrary.org/asset/338682151
https://macaulaylibrary.org/asset/557006241
https://macaulaylibrary.org/asset/106912321
Photo and Info
Illustration
https://macaulaylibrary.org/asset/113796
https://macaulaylibrary.org/asset/580755011
https://macaulaylibrary.org/asset/161164721
https://macaulaylibrary.org/asset/101134881
https://macaulaylibrary.org/asset/246777751
https://macaulaylibrary.org/asset/446160131
https://macaulaylibrary.org/asset/128234031
https://macaulaylibrary.org/asset/162524991
https://macaulaylibrary.org/asset/100986691
https://macaulaylibrary.org/asset/75762981
https://macaulaylibrary.org/asset/58904941
https://macaulaylibrary.org/asset/40589581
https://macaulaylibrary.org/asset/40589371
https://macaulaylibrary.org/asset/351852761
https://macaulaylibrary.org/asset/260228811
https://macaulaylibrary.org/asset/260229651
https://macaulaylibrary.org/asset/260229661
https://macaulaylibrary.org/asset/260229711
https://macaulaylibrary.org/asset/260229701
https://macaulaylibrary.org/asset/172647621
https://macaulaylibrary.org/asset/172647541
https://macaulaylibrary.org/asset/172647641
https://macaulaylibrary.org/asset/172647591
https://macaulaylibrary.org/asset/63231511
https://macaulaylibrary.org/asset/155845351
https://macaulaylibrary.org/asset/27567461
https://macaulaylibrary.org/asset/332498091
https://macaulaylibrary.org/asset/154139741
https://macaulaylibrary.org/asset/249225681
https://macaulaylibrary.org/asset/442675901
https://macaulaylibrary.org/asset/533327491
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https://macaulaylibrary.org/asset/328371401
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https://macaulaylibrary.org/asset/20994751
https://macaulaylibrary.org/asset/20994681
https://macaulaylibrary.org/asset/20994791
https://www.inaturalist.org/observations/9310930
https://macaulaylibrary.org/asset/133400801
https://macaulaylibrary.org/asset/133400911
https://macaulaylibrary.org/asset/133400791
https://macaulaylibrary.org/asset/133400781
https://macaulaylibrary.org/asset/174750931
https://macaulaylibrary.org/asset/193309391
https://macaulaylibrary.org/asset/221912961
https://macaulaylibrary.org/asset/222442601
https://macaulaylibrary.org/asset/222006341
https://macaulaylibrary.org/asset/222006271
https://macaulaylibrary.org/asset/184331211
https://macaulaylibrary.org/asset/184331261
https://macaulaylibrary.org/asset/184331251
https://macaulaylibrary.org/asset/575342741
https://macaulaylibrary.org/asset/575342751
https://macaulaylibrary.org/asset/575342721
https://macaulaylibrary.org/asset/583657341
https://macaulaylibrary.org/asset/59064311
https://macaulaylibrary.org/asset/59064351
https://macaulaylibrary.org/asset/338750211
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https://macaulaylibrary.org/asset/99399541
https://macaulaylibrary.org/asset/61042371
https://macaulaylibrary.org/asset/245671091
https://macaulaylibrary.org/asset/245671141
https://macaulaylibrary.org/asset/245671111
https://macaulaylibrary.org/asset/245671181
https://macaulaylibrary.org/asset/259304751
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https://macaulaylibrary.org/asset/259305251
https://macaulaylibrary.org/asset/193983181
https://macaulaylibrary.org/asset/193983191
https://macaulaylibrary.org/asset/111172261
https://macaulaylibrary.org/asset/95882601
https://macaulaylibrary.org/asset/95882581
https://macaulaylibrary.org/asset/95918041
https://macaulaylibrary.org/asset/95918131
https://macaulaylibrary.org/asset/215750111
https://macaulaylibrary.org/asset/215748641
https://macaulaylibrary.org/asset/215748651
https://macaulaylibrary.org/asset/215749981
https://macaulaylibrary.org/asset/215748701
https://macaulaylibrary.org/asset/40383221
https://macaulaylibrary.org/asset/489574491
https://macaulaylibrary.org/asset/58954681
https://macaulaylibrary.org/asset/281382051
https://macaulaylibrary.org/asset/281381991
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https://macaulaylibrary.org/asset/227289131
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https://macaulaylibrary.org/asset/263337491
https://macaulaylibrary.org/asset/263339841
https://www.inaturalist.org/observations/164976436
https://macaulaylibrary.org/asset/165348201
https://macaulaylibrary.org/asset/459976571
https://macaulaylibrary.org/asset/168545381
https://macaulaylibrary.org/asset/63155261
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https://macaulaylibrary.org/asset/43108181
Info
https://macaulaylibrary.org/asset/112452071
https://macaulaylibrary.org/asset/106384041
https://macaulaylibrary.org/asset/102181871
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