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northern wheatear
Oenanthe oenanthe
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capped wheatear
Oenanthe pileata
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red-winged starling
Onychognathus morio
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royal flycatcher
Onychorhynchus coronatus
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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white-rumped snowfinch
Onychostruthus taczanowskii
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hoatzin
Opisthocomus hoazin
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Kentucky warbler
Oporornis formosus
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crested bellbird
Oreoica gutturalis