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Silver-haired Bats
Lasionycteris
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Silver-rumped Needletail
Rhaphidura leucopygialis
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Silver-throated Tanager
Tangara icterocephala
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Silver-throated Tit
Aegithalos glaucogularis
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Silver-tipped Myotis
Myotis albescens
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Silvered Antbird
Sclateria naevia
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Silvereye
Zosterops lateralis
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Silvery Grebe
Podiceps occipitalis
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Silvery-cheeked Antshrike
Sakesphorus cristatus
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Silvery-cheeked Hornbill
Bycanistes brevis
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Silvery-fronted Tapaculo
Scytalopus argentifrons
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Silvery-throated Spinetail
Synallaxis subpudica
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Simple Greenbul
Chlorocichla simplex
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Sinai Rosefinch
Carpodacus synoicus
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Sinaloa Crow
Corvus sinaloae
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Sinaloa Wren
Thryophilus sinaloa
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Sinaloan Mastiff Bat
Molossus sinaloae
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Sincora Antwren
Formicivora grantsaui
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Sind Sparrow
Passer pyrrhonotus
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Singing Bushlark
Mirafra cantillans
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Singing Cisticola
Cisticola cantans
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Singing Honeyeater
Gavicalis virescens
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Singing Parrot
Geoffroyus heteroclitus
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Singing Quail
Dactylortyx thoracicus
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Siren
Siren
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Sirkeer Malkoha
Taccocua leschenaultii
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Slate-colored Antbird
Myrmelastes schistaceus
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Slate-colored Boubou
Laniarius funebris
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Slate-colored Coot
Fulica ardesiaca
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Slate-colored Grosbeak
Saltator grossus
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Slate-colored Hawk
Buteogallus schistaceus
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Slate-colored Seedeater
Sporophila schistacea
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Slate-colored Solitaire
Myadestes unicolor
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Slate-crowned Antpitta
Grallaricula nana
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Slate-headed Tody-Flycatcher
Poecilotriccus sylvia
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Slate-throated Gnatcatcher
Polioptila schistaceigula
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Slate-throated Redstart
Myioborus miniatus
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Slaty Antwren
Myrmotherula schisticolor
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Slaty Bristlefront
Merulaxis ater
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Slaty Brushfinch
Atlapetes schistaceus
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Slaty Elaenia
Elaenia strepera
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Slaty Finch
Spodiornis rusticus
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Slaty Flowerpiercer
Diglossa plumbea
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Slaty Gnateater
Conopophaga ardesiaca
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Slaty Spinetail
Synallaxis brachyura
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Slaty Vireo
Vireo brevipennis
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Slaty-backed Chat-Tyrant
Ochthoeca cinnamomeiventris
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Slaty-backed Flycatcher
Ficedula erithacus
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Slaty-backed Forest-Falcon
Micrastur mirandollei
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Slaty-backed Forktail
Enicurus schistaceus
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Slaty-backed Gull
Larus schistisagus
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Slaty-backed Nightingale-Thrush
Catharus fuscater
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Slaty-bellied Tesia
Tesia olivea
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Slaty-blue Flycatcher
Ficedula tricolor
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Slaty-breasted Rail
Lewinia striata
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Slaty-breasted Tinamou
Crypturellus boucardi
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Slaty-breasted Wood-Rail
Aramides saracura
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Slaty-capped Flycatcher
Leptopogon superciliaris
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Slaty-capped Shrike-Vireo
Vireolanius leucotis
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Slaty-headed Parakeet
Psittacula himalayana
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Slaty-legged Crake
Rallina eurizonoides
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Slaty-tailed Trogon
Trogon massena
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Slaty-winged Foliage-gleaner
Philydor fuscipenne
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Slender Antbird
Rhopornis ardesiacus
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Slender Meadow Katydid
Conocephalus fasciatus
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Slender-billed Crow
Corvus enca
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Slender-billed Greenbul
Stelgidillas gracilirostris
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Slender-billed Gull
Chroicocephalus genei
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Slender-billed Kite
Helicolestes hamatus
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Slender-billed Miner
Geositta tenuirostris
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Slender-billed Oriole
Oriolus tenuirostris
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Slender-billed Parakeet
Enicognathus leptorhynchus
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Slender-billed Scimitar-Babbler
Pomatorhinus superciliaris
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Slender-billed Starling
Onychognathus tenuirostris
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Slender-billed Tyrannulet
Inezia tenuirostris
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Slender-billed Xenops
Xenops tenuirostris
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Slender-footed Tyrannulet
Zimmerius gracilipes
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Slender-tailed Nightjar
Caprimulgus clarus
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Slit-faced Bats
Nycteridae
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Small Buttonquail
Turnix sylvaticus
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Small Minivet
Pericrocotus cinnamomeus
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Small Niltava
Niltava macgrigoriae
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Small Pratincole
Glareola lactea
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Small-billed Elaenia
Elaenia parvirostris
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Small-billed Tinamou
Crypturellus parvirostris
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Small-headed Elaenia
Elaenia sordida
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Smew
Mergellus albellus
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Smith's Longspur
Calcarius pictus
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Smoke-colored Pewee
Contopus fumigatus
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Smoky Bush-Tyrant
Myiotheretes fumigatus
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Smoky Warbler
Phylloscopus fuligiventer
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Smoky-brown Woodpecker
Dryobates fumigatus
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Smoky-fronted Tody-Flycatcher
Poecilotriccus fumifrons
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Smooth-billed Ani
Crotophaga ani
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Snail Kite
Rostrhamus sociabilis
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Snethlage's Antpitta
Hylopezus paraensis
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Snethlage's Tody-Tyrant
Hemitriccus minor
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Snow Bunting
Plectrophenax nivalis
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Snow Goose
Anser caerulescens
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Snow-capped Manakin
Lepidothrix nattereri
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