| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Neophoca cinerea | 44.1 | 55.9 | 227 | 119 | 222 | 216 | 24.1 |
| Neophocaena phocaenoides | 43.1 | 56.9 | 222 | 116 | 239 | 208 | 33.0 |
| Neotragus moschatus | 44.5 | 55.5 | 235 | 114 | 227 | 208 | 13.5 |
| Neovison vison | 42.3 | 57.7 | 219 | 113 | 230 | 222 | 11.4 |
| Nyctalus noctula | 43.9 | 56.1 | 213 | 131 | 232 | 208 | 12.0 |
| Nyctereutes procyonoides | 43.9 | 56.1 | 222 | 122 | 232 | 208 | 16.6 |
| Nycticebus coucang | 42.3 | 57.7 | 213 | 119 | 226 | 226 | 25.8 |
| Ochotona princeps | 45.3 | 54.7 | 236 | 119 | 219 | 210 | 7.0 |
| Octodon degus | 40.6 | 59.4 | 207 | 111 | 235 | 231 | 14.0 |
| Odocoileus hemionus | 41.3 | 58.7 | 210 | 114 | 250 | 210 | 22.0 |
| Odocoileus virginianus | 41.3 | 58.4 | 210 | 114 | 249 | 209 | 23.0 |
| Okapia johnstoni | 46.6 | 53.4 | 247 | 118 | 211 | 208 | 33.5 |
| Orcaella brevirostris | 42.7 | 57.3 | 227 | 108 | 233 | 216 | 30.0 |
| Orcinus orca | 43.1 | 56.9 | 231 | 107 | 230 | 217 | 90.0 |
| Oreamnos americanus | 42.3 | 57.7 | 219 | 113 | 237 | 215 | 20.8 |
| Oreotragus oreotragus | 43.2 | 56.8 | 228 | 111 | 231 | 214 | 25.9 |
| Ornithorhynchus anatinus | 40.1 | 59.9 | 200 | 114 | 258 | 212 | 22.6 |
| Orycteropus afer | 42.2 | 57.8 | 216 | 115 | 235 | 218 | 29.8 |
| Oryctolagus cuniculus | 44.0 | 56.0 | 225 | 120 | 226 | 213 | 9.0 |
| Oryx dammah | 44.3 | 55.7 | 235 | 112 | 222 | 215 | 27.5 |
| Oryx gazella | 44.4 | 55.6 | 233 | 115 | 223 | 213 | 23.8 |
| Oryx leucoryx | 44.1 | 55.9 | 232 | 114 | 223 | 215 | 20.8 |
| Otolemur crassicaudatus | 47.2 | 52.8 | 248 | 122 | 204 | 210 | 22.7 |
| Ourebia ourebi | 45.4 | 54.6 | 241 | 115 | 218 | 210 | 15.9 |
| Ovibos moschatus | 46.3 | 53.7 | 248 | 115 | 215 | 206 | 27.4 |
| Ovis ammon | 45.0 | 55.0 | 233 | 120 | 226 | 205 | 16.8 |
| Ovis aries | 45.3 | 54.7 | 235 | 120 | 224 | 205 | 22.8 |
| Ovis canadensis | 44.8 | 55.2 | 233 | 118 | 226 | 207 | 20.6 |
| Ozotoceros bezoarticus | 39.3 | 60.7 | 192 | 116 | 269 | 207 | 21.9 |
| Pan paniscus | 44.6 | 55.4 | 243 | 107 | 215 | 219 | 55.0 |
| Pan troglodytes | 44.8 | 55.2 | 243 | 108 | 216 | 217 | 59.4 |
| Panthera leo | 43.8 | 56.3 | 218 | 125 | 230 | 211 | 27.0 |
| Panthera onca | 45.2 | 54.8 | 221 | 133 | 225 | 205 | 28.0 |
| Panthera pardus | 44.4 | 55.6 | 221 | 127 | 227 | 209 | 27.3 |
| Panthera tigris | 45.0 | 55.0 | 223 | 130 | 221 | 210 | 26.3 |
| Papio hamadryas | 45.0 | 55.0 | 245 | 108 | 219 | 212 | 37.5 |
| Pecari tajacu | 45.5 | 54.5 | 237 | 120 | 207 | 220 | 31.5 |
| Peponocephala electra | 42.4 | 57.6 | 231 | 102 | 228 | 224 | 47.0 |
| Perameles gunnii | 39.0 | 61.0 | 192 | 114 | 244 | 234 | 6.1 |
| Perodicticus potto | 43.6 | 56.4 | 224 | 118 | 211 | 231 | 26.8 |