| Brown Oriole Oriolus szalayi | Passeriformes / Oriolidae | LC |
| Dark-throated Oriole Oriolus xanthonotus | Passeriformes / Oriolidae | LC |
| Striped Sparrow Oriturus superciliosus | Passeriformes / Passerellidae | LC |
| Brown-capped Tyrannulet Ornithion brunneicapillus | Passeriformes / Tyrannidae | LC |
| White-lored Tyrannulet Ornithion inerme | Passeriformes / Tyrannidae | LC |
| Yellow-bellied Tyrannulet Ornithion semiflavum | Passeriformes / Tyrannidae | LC |
| Piping Bellbird Ornorectes cristatus | Passeriformes / Oreoicidae | LC |
| Andean Swallow Orochelidon andecola | Passeriformes / Hirundinidae | LC |
| Pale-footed Swallow Orochelidon flavipes | Passeriformes / Hirundinidae | LC |
| Brown-bellied Swallow Orochelidon murina | Passeriformes / Hirundinidae | LC |
| East Brazilian Chachalaca Ortalis araucuan | Galliformes / Cracidae | LC |
| Chaco Chachalaca Ortalis canicollis | Galliformes / Cracidae | LC |
| Grey-headed Chachalaca Ortalis cinereiceps | Galliformes / Cracidae | LC |
| Colombian Chachalaca Ortalis columbiana | Galliformes / Cracidae | LC |
| Rufous-headed Chachalaca Ortalis erythroptera | Galliformes / Cracidae | VU |
| Chestnut-winged Chachalaca Ortalis garrula | Galliformes / Cracidae | LC |
| Speckled Chachalaca Ortalis guttata | Galliformes / Cracidae | LC |
| White-bellied Chachalaca Ortalis leucogastra | Galliformes / Cracidae | LC |
| Little Chachalaca Ortalis motmot | Galliformes / Cracidae | NE |
| West Mexican Chachalaca Ortalis poliocephala | Galliformes / Cracidae | LC |
| Rufous-vented Chachalaca Ortalis ruficauda | Galliformes / Cracidae | LC |
| Chestnut-headed Chachalaca Ortalis ruficeps | Galliformes / Cracidae | NE |
| Scaled Chachalaca Ortalis squamata | Galliformes / Cracidae | LC |
| Buff-browed Chachalaca Ortalis superciliaris | Galliformes / Cracidae | LC |
| Plain Chachalaca Ortalis vetula | Galliformes / Cracidae | LC |
| Rufous-bellied Chachalaca Ortalis wagleri | Galliformes / Cracidae | LC |
| Olive-green Tanager Orthogonys chloricterus | Passeriformes / Mitrospingidae | LC |
| Papuan Logrunner Orthonyx novaeguineae | Passeriformes / Orthonychidae | LC |
| Chowchilla Orthonyx spaldingii | Passeriformes / Orthonychidae | LC |
| Australian Logrunner Orthonyx temminckii | Passeriformes / Orthonychidae | LC |
| Red-bellied Macaw Orthopsittaca manilatus | Psittaciformes / Psittacidae | LC |
| Antillean Crested Hummingbird Orthorhyncus cristatus | Apodiformes / Trochilidae | LC |
| Visayan Tailorbird Orthotomus castaneiceps | Passeriformes / Cisticolidae | LC |
| Cambodian Tailorbird Orthotomus chaktomuk | Passeriformes / Cisticolidae | NT |
| Green-backed Tailorbird Orthotomus chloronotus | Passeriformes / Cisticolidae | LC |
| White-eared Tailorbird Orthotomus cinereiceps | Passeriformes / Cisticolidae | LC |
| Grey-backed Tailorbird Orthotomus derbianus | Passeriformes / Cisticolidae | LC |
| Rufous-fronted Tailorbird Orthotomus frontalis | Passeriformes / Cisticolidae | LC |
| Black-headed Tailorbird Orthotomus nigriceps | Passeriformes / Cisticolidae | LC |
| Ashy Tailorbird Orthotomus ruficeps | Passeriformes / Cisticolidae | LC |
| Yellow-breasted Tailorbird Orthotomus samarensis | Passeriformes / Cisticolidae | LC |
| Olive-backed Tailorbird Orthotomus sepium | Passeriformes / Cisticolidae | LC |
| Rufous-tailed Tailorbird Orthotomus sericeus | Passeriformes / Cisticolidae | LC |
| Swamp Francolin Ortygornis gularis | Galliformes / Phasianidae | NT |
| Grey Francolin Ortygornis pondicerianus | Galliformes / Phasianidae | LC |
| Crested Francolin Ortygornis sephaena | Galliformes / Phasianidae | LC |
| Quailfinch Ortygospiza atricollis | Passeriformes / Estrildidae | LC |
| Quail-plover Ortyxelos meiffrenii | Charadriiformes / Turnicidae | LC |
| Pheasant Pigeon Otidiphaps nobilis | Columbiformes / Columbidae | NE |
| Flores Scops Owl Otus alfredi | Strigiformes / Strigidae | EN |