Grzimek Birds
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- Eurasian golden oriole
Oriolus oriolus
- Eurasian golden oriole
- olive-backed oriole
Oriolus sagittatus
- olive-backed oriole
- rufous-vented chachalaca
Ortalis ruficauda
- rufous-vented chachalaca
- plain chachalaca
Ortalis vetula
- plain chachalaca
- common tailorbird
Orthotomus sutorius
- common tailorbird
- African quailfinch
Ortygospiza atricollis
- African quailfinch
- great bustard
Otis tarda
- great bustard
- common scops-owl
Otus scops
- common scops-owl
- sharpbill
Oxyruncus cristatus
- sharpbill
- golden whistler
Pachycephala pectoralis
- golden whistler
- rufous whistler
Pachycephala rufiventris
- rufous whistler
- Regent whistler
Pachycephala schlegelii
- Regent whistler
- thick-billed cuckoo
Pachycoccyx audeberti
- thick-billed cuckoo
- Pachyornis elephantopus
- Mappin's moas
Pachyornis mappini
- Mappin's moas