mammifères
| Nom | Type | Notoriété | Popularité |
|---|---|---|---|
| Otarie À Crinière | Taxon | 46 | 13.1 |
| Otarie des Galapagos | Taxon | 36 | 51.4 |
| Otarie de L'île Guadalupe | Taxon | 36 | 0.6 |
| Otarie de Kerguelen | Taxon | 45 | 7.1 |
| Otarie de Californie | Taxon | 48 | 35.1 |
| Otarie | Taxon | 75 | 115.8 |
| Ossimi | Concept | 1 | 0.2 |
| Oscar | Objet | 19 | 14.1 |
| Osbornoceros | Taxon | 8 | 0.1 |
| Oryzorictinae | Taxon | 14 | 0.3 |
| Oryzorictes Tetradactylus | Taxon | 22 | 0.7 |
| Oryzorictes Hova | Taxon | 24 | 0.7 |
| Oryzorictes | Taxon | 21 | 0.8 |
| Oryctérope | Taxon | 106 | 15.5 |
| Orycteropus | Taxon | 22 | 2.4 |
| Orycteropodidae | Taxon | 44 | 5.3 |
| Orophodon Hapaloides | Taxon | 4 | 0.2 |
| Ornithorynque | Taxon | 116 | 679.9 |
| Ornithorhynchus Maximus | Taxon | 7 | 1.4 |
| Ornithorhynchidae | Taxon | 45 | 11.2 |
| Orenbourg | Concept | 5 | 0.5 |
| Orangey | Objet | 14 | 4.2 |
| Oranda | Concept | 17 | 7.8 |
| Old Tom | Objet | 4 | 0.6 |
| Old Bet | Objet | 5 | 0.1 |
| Okapi | Taxon | 98 | 199.0 |
| Oie Domestique | Concept | 61 | 94.5 |
| Octomylodon | Taxon | 3 | 0.0 |
| Obdurodon Insignis | Taxon | 10 | 1.7 |
| Obdurodon Dicksoni | Taxon | 11 | 1.4 |
| Obaysch | Objet | 14 | 0.0 |
| Néro | Objet | 2 | 0.3 |
| Nénette | Objet | 2 | 16.6 |
| Numéro 16 | Objet | 10 | 0.4 |
| Notoungulata | Taxon | 26 | 2.5 |
| Notostylopidae | Taxon | 10 | 0.3 |
| Notoryctidae | Taxon | 25 | 2.5 |
| Notoryctes Typhlops | Taxon | 37 | 0.7 |
| Notiosorex Cockrumi | Taxon | 16 | 0.2 |
| Notiosorex | Taxon | 21 | 0.5 |
| Notioprogonia | Taxon | 11 | 0.1 |
| Nothrotheriops | Taxon | 10 | 1.8 |
| North Ronaldsay | Concept | 11 | 0.4 |
| Noriphoca | Taxon | 4 | 0.2 |
| Noori | Concept | 3 | 0.2 |
| Noire du Velay | Concept | 5 | 9.9 |
| Noire de Thibar | Concept | 3 | 6.9 |
| Ningxiatherium | Taxon | 4 | 0.3 |
| Nimravus | Taxon | 16 | 1.9 |
| Nimravinae | Taxon | 8 | 0.3 |