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Oahu Amakihi
Chlorodrepanis flava
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Oahu Elepaio
Chasiempis ibidis
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Oak Titmouse
Baeolophus inornatus
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Oak Toad
Anaxyrus quercicus
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Oaxaca Sparrow
Aimophila notosticta
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Oblong-winged Katydid
Amblycorypha oblongifolia
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Ocellated Antbird
Phaenostictus mcleannani
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Ocellated Crake
Micropygia schomburgkii
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Ocellated Piculet
Picumnus dorbignyanus
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Ocellated Poorwill
Nyctiphrynus ocellatus
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Ocellated Quail
Cyrtonyx ocellatus
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Ocellated Tapaculo
Acropternis orthonyx
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Ocellated Thrasher
Toxostoma ocellatum
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Ocellated Turkey
Meleagris ocellata
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Ocellated Woodcreeper
Xiphorhynchus ocellatus
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Ochraceous Attila
Attila torridus
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Ochraceous Bulbul
Alophoixus ochraceus
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Ochraceous Piculet
Picumnus limae
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Ochraceous Wren
Troglodytes ochraceus
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Ochre-backed Woodpecker
Celeus ochraceus
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Ochre-bellied Dove
Leptotila ochraceiventris
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Ochre-bellied Flycatcher
Mionectes oleagineus
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Ochre-breasted Antpitta
Grallaricula flavirostris
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Ochre-breasted Brushfinch
Atlapetes semirufus
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Ochre-breasted Foliage-gleaner
Anabacerthia lichtensteini
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Ochre-breasted Pipit
Anthus nattereri
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Ochre-breasted Tanager
Chlorothraupis stolzmanni
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Ochre-browed Thistletail
Asthenes coryi
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Ochre-cheeked Spinetail
Synallaxis scutata
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Ochre-collared Piculet
Picumnus temminckii
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Ochre-faced Tody-Flycatcher
Poecilotriccus plumbeiceps
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Ochre-flanked Tapaculo
Eugralla paradoxa
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Ochre-fronted Antpitta
Grallaricula ochraceifrons
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Ochre-marked Parakeet
Pyrrhura cruentata
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Ochre-rumped Antbird
Drymophila ochropyga
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Ochre-rumped Bunting
Emberiza yessoensis
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Ochre-striped Antpitta
Grallaria dignissima
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Ognev's Long-eared Bat
Plecotus ognevi
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Oilbird
Steatornis caripensis
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Old World Fruit Bats
Pteropodidae
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Old World Leaf-nosed Bats
Hipposideridae
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Old World Roundleaf Bats
Hipposideros
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Old World Sheath-tailed Bats
Emballonura
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Oleaginous Hemispingus
Sphenopsis frontalis
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Olivaceous Elaenia
Elaenia mesoleuca
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Olivaceous Flatbill
Rhynchocyclus olivaceus
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Olivaceous Greenlet
Hylophilus olivaceus
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Olivaceous Piculet
Picumnus olivaceus
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Olivaceous Saltator
Saltator olivascens
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Olivaceous Schiffornis
Schiffornis olivacea
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Olivaceous Siskin
Spinus olivaceus
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Olivaceous Woodcreeper
Sittasomus griseicapillus
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Olive Bulbul
Iole viridescens
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Olive Bushshrike
Telophorus olivaceus
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Olive Finch
Arremon castaneiceps
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Olive Long-tailed Cuckoo
Cercococcyx olivinus
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Olive Oropendola
Psarocolius bifasciatus
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Olive Sparrow
Arremonops rufivirgatus
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Olive Spinetail
Cranioleuca obsoleta
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Olive Sunbird
Cyanomitra olivacea
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Olive Thrush
Turdus olivaceus
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Olive Warbler
Peucedramus taeniatus
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Olive Whistler
Pachycephala olivacea
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Olive Woodpecker
Chloropicus griseocephalus
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Olive-backed Euphonia
Euphonia gouldi
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Olive-backed Foliage-gleaner
Automolus infuscatus
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Olive-backed Oriole
Oriolus sagittatus
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Olive-backed Pipit
Anthus hodgsoni
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Olive-backed Sunbird
Cinnyris jugularis
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Olive-backed Tailorbird
Orthotomus sepium
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Olive-backed Tanager
Mitrospingus oleagineus
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Olive-backed Woodcreeper
Xiphorhynchus triangularis
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Olive-backed Woodpecker
Dinopium rafflesii
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Olive-bellied Sunbird
Cinnyris chloropygius
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Olive-capped Warbler
Setophaga pityophila
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Olive-chested Flycatcher
Myiophobus cryptoxanthus
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Olive-crowned Crescentchest
Melanopareia maximiliani
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Olive-crowned Yellowthroat
Geothlypis semiflava
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Olive-flanked Robin-Chat
Cossypha anomala
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Olive-green Camaroptera
Camaroptera chloronota
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Olive-green Tanager
Orthogonys chloricterus
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Olive-green Tyrannulet
Phylloscartes virescens
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Olive-sided Flycatcher
Contopus cooperi
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Olive-spotted Hummingbird
Talaphorus chlorocercus
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Olive-striped Flycatcher
Mionectes olivaceus
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Olive-throated Parakeet
Eupsittula nana
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Olive-tree Warbler
Hippolais olivetorum
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Olive-winged Bulbul
Pycnonotus plumosus
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Omao
Myadestes obscurus
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One-colored Becard
Pachyramphus homochrous
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Opal-crowned Manakin
Lepidothrix iris
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Opal-rumped Tanager
Tangara velia
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Orange Ground-Thrush
Geokichla gurneyi
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Orange Minivet
Pericrocotus flammeus
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Orange Oriole
Icterus auratus
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Orange River Francolin
Scleroptila gutturalis
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Orange River White-eye
Zosterops pallidus
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Orange-backed Troupial
Icterus croconotus
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Orange-backed Woodpecker
Reinwardtipicus validus
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Orange-banded Flycatcher
Nephelomyias lintoni
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