Olive-backed Pipit
Olive-backed Sunbird
Olive-breasted Greenbul
Olive-capped Flowerpecker
Orange Weaver
Orange-backed Troupial
Orange-bellied Euphonia
Orange-bellied Flowerpecker
Orange-bellied Fruit Dove
Orange-breasted Bushshrike
Orange-breasted Fig Parrot
Orange-breasted Sunbird
Orange-breasted Trogon
Orange-cheeked Waxbill
Orange-chinned Parakeet
Orange-fronted Hanging Parrot
Orange-headed Thrush