| New World porcupine(expression, creature, geohistory, chattian) |
| Nimravus(noun, creature, geohistory, rupelian) |
| Notoplax(noun, creature, geogistory, oligocene) |
| Oceanic dolphin(expression, creature, geohistory, chattian) |
| Old World monkey(expression, creature, geogistory, oligocene) |
| Oregonia(noun, creature, geogistory, oligocene) |
| Osbornodon(noun, creature, geohistory, rupelian) |
| Osbornodon iamonensis(expression, creature, geohistory, rupelian) |
| Palaelodidae(noun, creature, geohistory, rupelian) |
| Paraceratherium(noun, creature, geohistory, rupelian) |
| Paradaphoenus(noun, creature, geohistory, rupelian) |
| Paraenhydrocyon(noun, creature, geohistory, rupelian) |
| Paraenhydrocyon josephi(expression, creature, geohistory, rupelian) |
| Passeroidea(noun, creature, geogistory, oligocene) |
| Paucituberculata(noun, creature, geogistory, oligocene) |
| Pelican(noun, creature, geohistory, chattian) |
| Peramelemorphia(noun, creature, geohistory, chattian) |
| Phalangeriformes(noun, creature, geogistory, oligocene) |
| Phascolarctidae(noun, creature, geohistory, chattian) |
| Philotrox(noun, creature, geohistory, rupelian) |