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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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Orange-banded Thrush
Geokichla peronii
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Orange-bellied Antwren
Terenura sicki
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Orange-bellied Euphonia
Euphonia xanthogaster
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Orange-bellied Flowerpecker
Dicaeum trigonostigma
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Orange-bellied Fruit-Dove
Ptilinopus iozonus
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Orange-bellied Leafbird
Chloropsis hardwickii
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Orange-bellied Manakin
Lepidothrix suavissima
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Orange-billed Nightingale-Thrush
Catharus aurantiirostris
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Orange-billed Sparrow
Arremon aurantiirostris
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Orange-breasted Bunting
Passerina leclancherii
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Orange-breasted Falcon
Falco deiroleucus
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Orange-breasted Fruiteater
Pipreola jucunda
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Orange-breasted Green-Pigeon
Treron bicinctus
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Orange-breasted Sunbird
Anthobaphes violacea
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Orange-breasted Thornbird
Phacellodomus ferrugineigula
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Orange-breasted Trogon
Harpactes oreskios
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Orange-cheeked Parrot
Pyrilia barrabandi
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Orange-cheeked Waxbill
Estrilda melpoda
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Orange-chinned Parakeet
Brotogeris jugularis
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Orange-collared Manakin
Manacus aurantiacus
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Orange-crested Flycatcher
Myiophobus phoenicomitra
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Orange-crowned Manakin
Heterocercus aurantiivertex
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Orange-crowned Oriole
Icterus auricapillus
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Orange-crowned Warbler
Leiothlypis celata
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Orange-eyed Flycatcher
Tolmomyias traylori
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Orange-eyed Thornbird
Phacellodomus erythrophthalmus
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Orange-footed Scrubfowl
Megapodius reinwardt
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Orange-fronted Barbet
Capito squamatus
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Orange-fronted Parakeet
Eupsittula canicularis
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Orange-fronted Plushcrown
Metopothrix aurantiaca
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Orange-headed Tanager
Thlypopsis sordida
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Orange-headed Thrush
Geokichla citrina
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Orange-throated Longclaw
Macronyx capensis
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Orange-throated Tanager
Wetmorethraupis sterrhopteron
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Orange-winged Parrot
Amazona amazonica
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Orchard Oriole
Icterus spurius
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Oriental Bay-Owl
Phodilus badius
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Oriental Cuckoo
Cuculus optatus
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Oriental Darter
Anhinga melanogaster
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Oriental Greenfinch
Chloris sinica
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Oriental Honey-buzzard
Pernis ptilorhynchus
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Oriental Magpie
Pica serica
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Oriental Magpie-Robin
Copsychus saularis
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Oriental Pied-Hornbill
Anthracoceros albirostris
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Oriental Plover
Charadrius veredus
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Oriental Pratincole
Glareola maldivarum
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Oriental Reed Warbler
Acrocephalus orientalis
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Oriental Scops-Owl
Otus sunia
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Oriental Skylark
Alauda gulgula
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Oriental Turtle-Dove
Streptopelia orientalis
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Oriente Warbler
Teretistris fornsi
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Orinocan Saltator
Saltator orenocensis
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Orinoco Goose
Oressochen jubatus
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Orinoco Softtail
Thripophaga cherriei
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Oriole Blackbird
Gymnomystax mexicanus
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Oriole Warbler
Hypergerus atriceps
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Oriole Whistler
Pachycephala orioloides
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Ornate Chorus Frog
Pseudacris ornata
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Ornate Flycatcher
Myiotriccus ornatus
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Ornate Hawk-Eagle
Spizaetus ornatus
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Ornate Stipplethroat
Epinecrophylla ornata
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Ornate Tinamou
Nothoprocta ornata
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Ortolan Bunting
Emberiza hortulana
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Osprey
Pandion haliaetus
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Oustalet's Tyrannulet
Phylloscartes oustaleti
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Ovenbird
Seiurus aurocapilla
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Owston's Tit
Sittiparus owstoni
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Pacific Antwren
Myrmotherula pacifica
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Pacific Baza
Aviceda subcristata
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Pacific Black Duck
Anas superciliosa
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Pacific Chorus Frog
Hyliola regilla
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Pacific Elaenia
Myiopagis subplacens
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Pacific Emerald Dove
Chalcophaps longirostris
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Pacific Golden-Plover
Pluvialis fulva
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Pacific Imperial-Pigeon
Ducula pacifica
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Pacific Kingfisher
Todiramphus sacer
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Pacific Koel
Eudynamys orientalis
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Pacific Loon
Gavia pacifica
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Pacific Parakeet
Psittacara strenuus
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Pacific Parrotlet
Forpus coelestis
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