O. maximus may refer to:
- Ornithorhynchus maximus, a supposed extinct platypus species, now known to be based on an echidna
- Otomys maximus, the large Vlei rat, a rodent species found in Angola, Botswana, Democratic Republic of the Congo, Namibia and Zambia
See also
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This disambiguation page lists articles associated with the same abbreviated species scientific name.
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