Showing below up to 50 results in range #19,501 to #19,550.
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- Orthopsittaca → Category:Orthopsittaca
- Orthopsittaca manilata → Red-bellied Macaw
- Orthopsittaca manilatus → Red-bellied Macaw
- Orthorhyncus → Category:Orthorhyncus
- Orthorhyncus cristatus → Antillean Crested Hummingbird
- Orthotomus → Category:Orthotomus
- Orthotomus Sutorius → Common Tailorbird
- Orthotomus atrogularis → Dark-necked Tailorbird
- Orthotomus castaneiceps → Philippine Tailorbird
- Orthotomus castaneiceps chloronotus → Trilling Tailorbird
- Orthotomus chaktomuk → Cambodian Tailorbird
- Orthotomus chloronotus → Trilling Tailorbird
- Orthotomus cinereiceps → White-eared Tailorbird
- Orthotomus cuculatus → Mountain Tailorbird
- Orthotomus cucullatus → Mountain Tailorbird
- Orthotomus derbianus → Grey-backed Tailorbird
- Orthotomus frontalis → Rufous-fronted Tailorbird
- Orthotomus heterolaemus → Rufous-headed Tailorbird
- Orthotomus metopias → African Tailorbird
- Orthotomus moreaui → Long-billed Tailorbird
- Orthotomus nigriceps → Black-headed Tailorbird
- Orthotomus ruficeps → Ashy Tailorbird
- Orthotomus ruficeps borneoensis → Ashy Tailorbird
- Orthotomus samarensis → Yellow-breasted Tailorbird
- Orthotomus sepium → Olive-backed Tailorbird
- Orthotomus sericeus → Rufous-tailed Tailorbird
- Orthotomus sutorius → Common Tailorbird
- Ortygospiza → Category:Ortygospiza
- Ortygospiza atricollis → Black-faced Quailfinch
- Ortygospiza atricollis atricollis → African Quailfinch
- Ortygospiza fuscocrissa → African Quailfinch
- Ortygospiza gabonensis → Black-chinned Quailfinch
- Ortygospiza locustella → Locust Finch
- Ortyxelos → Category:Ortyxelos
- Ortyxelos meiffrenii → Quail-plover
- Oryzoborus → Category:Oryzoborus
- Oryzoborus angolensis → Chestnut-bellied Seed Finch
- Oryzoborus atrirostris → Black-billed Seed Finch
- Oryzoborus crassirostris → Large-billed Seed Finch
- Oryzoborus funereus → Thick-billed Seed Finch
- Oryzoborus maximiliani → Great-billed Seed Finch
- Oryzoborus nuttingi → Nicaraguan Seed Finch
- Ostfreisisches Wattenmeer (Waddensee National Park - Lower Saxony) → Ostfriesisches Wattenmeer (Waddensee National Park - Lower Saxony)
- Ostriches → Category:Struthionidae
- Otago Shag → Stewart Island Shag
- Otamendi National Reserve, Buenos Aires, Argentina(Otamendi National Reserve 70Km north Buenos Aires) → Otamendi National Reserve
- Otididae → Category:Otididae
- Otidiformes → Category:Otidiformes
- Otidiphaps → Category:Otidiphaps
- Otidiphaps nobilis → Pheasant Pigeon


