| Species (N=389) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Neophocaena phocaenoides | 38.6 | 61.4 | 162 | 42 | 102 | 222 | 33.0 |
| Neotragus moschatus | 36.0 | 64.0 | 154 | 36 | 112 | 226 | 13.5 |
| Neovison vison | 36.9 | 63.1 | 147 | 50 | 115 | 222 | 11.4 |
| Nyctalus noctula | 37.9 | 62.1 | 152 | 48 | 115 | 213 | 12.0 |
| Nyctereutes procyonoides | 38.8 | 61.2 | 153 | 52 | 113 | 210 | 16.6 |
| Nycticebus coucang | 42.6 | 57.4 | 180 | 45 | 90 | 213 | 25.8 |
| Ochotona princeps | 42.9 | 57.1 | 187 | 38 | 89 | 211 | 7.0 |
| Octodon degus | 35.8 | 64.2 | 149 | 42 | 112 | 231 | 14.0 |
| Odocoileus hemionus | 35.0 | 65.0 | 140 | 45 | 129 | 214 | 22.0 |
| Odocoileus virginianus | 34.7 | 65.3 | 142 | 41 | 127 | 218 | 23.0 |
| Okapia johnstoni | 40.0 | 60.0 | 173 | 38 | 96 | 221 | 33.5 |
| Orcaella brevirostris | 38.0 | 62.0 | 161 | 39 | 101 | 225 | 30.0 |
| Orcinus orca | 37.1 | 62.9 | 158 | 38 | 109 | 223 | 90.0 |
| Oreamnos americanus | 33.5 | 66.5 | 145 | 32 | 123 | 228 | 20.8 |
| Oreotragus oreotragus | 35.8 | 64.2 | 153 | 36 | 115 | 224 | 25.9 |
| Ornithorhynchus anatinus | 35.1 | 64.9 | 136 | 40 | 113 | 212 | 22.6 |
| Orycteropus afer | 39.3 | 60.7 | 171 | 34 | 89 | 228 | 29.8 |
| Oryctolagus cuniculus | 39.8 | 60.2 | 175 | 34 | 104 | 212 | 9.0 |
| Oryx dammah | 37.3 | 62.7 | 159 | 38 | 107 | 224 | 27.5 |
| Oryx gazella | 37.7 | 62.3 | 153 | 46 | 112 | 217 | 23.8 |
| Oryx leucoryx | 37.1 | 62.9 | 153 | 43 | 111 | 221 | 20.8 |
| Otolemur crassicaudatus | 43.8 | 56.3 | 187 | 44 | 92 | 205 | 22.7 |
| Ourebia ourebi | 36.2 | 63.8 | 150 | 41 | 119 | 218 | 15.9 |
| Ovibos moschatus | 36.2 | 63.8 | 152 | 39 | 111 | 226 | 27.4 |
| Ovis ammon | 35.8 | 64.2 | 152 | 37 | 113 | 226 | 16.8 |
| Ovis aries | 35.0 | 65.0 | 148 | 37 | 116 | 227 | 22.8 |
| Ovis canadensis | 35.0 | 65.0 | 148 | 37 | 118 | 225 | 20.6 |
| Ozotoceros bezoarticus | 34.3 | 65.7 | 141 | 40 | 129 | 218 | 21.9 |
| Pan paniscus | 41.5 | 58.5 | 180 | 38 | 110 | 197 | 55.0 |
| Pan troglodytes | 42.1 | 57.9 | 182 | 39 | 107 | 197 | 59.4 |
| Panthera leo | 40.0 | 60.0 | 153 | 58 | 111 | 206 | 27.0 |
| Panthera onca | 40.0 | 60.0 | 157 | 54 | 108 | 209 | 28.0 |
| Panthera pardus | 39.2 | 60.8 | 150 | 57 | 115 | 206 | 27.3 |
| Panthera tigris | 41.3 | 58.7 | 156 | 62 | 109 | 201 | 26.3 |
| Papio hamadryas | 43.6 | 56.4 | 185 | 44 | 87 | 209 | 37.5 |
| Pecari tajacu | 36.4 | 63.6 | 156 | 36 | 105 | 231 | 31.5 |
| Peponocephala electra | 37.1 | 62.9 | 158 | 38 | 107 | 225 | 47.0 |
| Perameles gunnii | 35.5 | 64.5 | 140 | 38 | 110 | 213 | 6.1 |
| Perodicticus potto | 42.0 | 58.0 | 184 | 38 | 87 | 219 | 26.8 |
| Petaurista alborufus | 37.1 | 62.9 | 161 | 34 | 113 | 217 | 21.4 |