Grzimek Mammals
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- white-tailed olalla rat
Olallamys albicauda
- white-tailed olalla rat
- muskrat
Ondatra zibethicus
- muskrat
- bridled nail-tailed wallaby
Onychogalea fraenata
- bridled nail-tailed wallaby
- killer whale
Orcinus orca
- killer whale
- mountain goat
Oreamnos americanus
- mountain goat
- klipspringer
Oreotragus oreotragus
- klipspringer
- klipspringer
Oreotragus oreotragus
- klipspringer
- duck-billed platypus
Ornithorhynchus anatinus
- duck-billed platypus
- duck-billed platypus
Ornithorhynchus anatinus
- duck-billed platypus
- duck-billed platypus
Ornithorhynchus anatinus
- duck-billed platypus
- giant pocket gopher
Orthogeomys grandis
- giant pocket gopher
- aardvark
Orycteropus afer
- aardvark
- European rabbit
Oryctolagus cuniculus
- European rabbit
- Arabian oryx
Oryx leucoryx
- Arabian oryx
- marsh rice rat
Oryzomys palustris
- marsh rice rat