Dodatak:Popis sisavaca, Or
Orc
uredi, Orcaella
- Orcinus citoniensies (Capellini, 1883) †
- Orcinus meyeri Brandt 1873 †
- Orcinus orca (Linnaeus, 1758)
- Orcinus orca eschrichti Reinhardt 1866
- Orcinus orca pacifica Gray 1870
- Orcinus paleorca Matsumoto, 1937 †
Mammalia → Cetacea → Odontoceti → Delphinida → Delphinoidea → Delphinidae
Ord
uredi- †Ordolagus teilhardi Burke 1941
Mammalia → Lagomorpha → Leporidae
Ore
uredi, Oreamnos , Oreotragus
Orn
uredi, Ornithorhynchidae , Ornithorhynchus
Ort
uredi, Orthogeomys
Ory
uredi, Orycteropodidae , Orycteropus
Oryctolagus Lilljeborg 1874
uredi- Oryctolagus cuniculus (Linnaeus, 1758)
- Oryctolagus cuniculus algirus (Loche, 1858)
- Oryctolagus cuniculus brachyotus Trouessart, 1917
- Oryctolagus cuniculus cnossius Bate, 1906
- Oryctolagus cuniculus cuniculus (Linnaeus, 1758)
- Oryctolagus cuniculus habetensis Cabrera, 1923
- Oryctolagus cuniculus huxleyi Haeckel, 1874
Mammalia → Lagomorpha → Leporidae → Leporinae , Oryx , Oryzomys , Oryzorictes