| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 42.7 | 57.3 | 191 | 101 | 183 | 209 | 18.2 |
| Martes martes | 43.1 | 56.9 | 193 | 102 | 179 | 210 | 18.2 |
| Martes pennanti | 43.4 | 56.6 | 193 | 104 | 179 | 208 | 14.3 |
| Martes zibellina | 42.8 | 57.2 | 188 | 104 | 184 | 207 | 18.4 |
| Mazama americana | 34.8 | 65.2 | 145 | 93 | 208 | 238 | 17.1 |
| Megaptera novaeangliae | 39.2 | 60.8 | 178 | 90 | 180 | 236 | 95.0 |
| Meles meles | 38.0 | 62.0 | 170 | 90 | 195 | 229 | 18.6 |
| Melogale moschata | 41.5 | 58.5 | 181 | 103 | 183 | 217 | 19.0 |
| Melursus ursinus | 42.4 | 57.6 | 168 | 122 | 185 | 209 | 33.3 |
| Mephitis mephitis | 35.7 | 64.3 | 151 | 93 | 207 | 233 | 13.9 |
| Meriones unguiculatus | 37.6 | 62.4 | 161 | 96 | 200 | 227 | 6.3 |
| Mesocricetus auratus | 35.4 | 64.6 | 144 | 98 | 215 | 227 | 3.9 |
| Mesoplodon europaeus | 38.6 | 61.4 | 176 | 88 | 183 | 237 | 48.0 |
| Metachirus nudicaudatus | 34.2 | 65.8 | 140 | 93 | 223 | 226 | 3.0 |
| Mogera wogura | 34.2 | 65.8 | 146 | 88 | 202 | 248 | 3.2 |
| Monodelphis domestica | 38.8 | 61.2 | 167 | 99 | 202 | 217 | 5.1 |
| Monodon monoceros | 41.5 | 58.5 | 188 | 96 | 174 | 226 | 50.0 |
| Muntiacus muntjak | 37.4 | 62.6 | 157 | 99 | 197 | 231 | 18.8 |
| Muntiacus reevesi | 36.3 | 63.7 | 154 | 94 | 200 | 236 | 23.2 |
| Mus musculus | 38.6 | 61.4 | 173 | 91 | 189 | 231 | 4.0 |
| Mustela erminea | 38.6 | 61.4 | 175 | 89 | 189 | 231 | 12.5 |
| Mustela frenata | 38.7 | 61.3 | 172 | 93 | 196 | 223 | 8.8 |
| Mustela nigripes | 39.9 | 60.1 | 177 | 96 | 189 | 222 | 9.4 |
| Mustela nivalis | 41.2 | 58.8 | 183 | 99 | 183 | 219 | 9.1 |
| Mustela putorius | 39.5 | 60.5 | 173 | 97 | 193 | 221 | 11.1 |
| Mustela sibirica | 40.8 | 59.2 | 182 | 97 | 182 | 223 | 8.8 |
| Myrmecobius fasciatus | 39.5 | 60.5 | 161 | 111 | 207 | 209 | 11.0 |
| Mystacina tuberculata | 38.7 | 61.3 | 163 | 102 | 199 | 220 | 7.6 |
| Naemorhedus baileyi | 38.3 | 61.7 | 164 | 98 | 185 | 237 | 19.0 |
| Naemorhedus caudatus | 39.8 | 60.2 | 174 | 98 | 176 | 236 | 20.3 |
| Naemorhedus goral | 39.2 | 60.8 | 171 | 97 | 179 | 237 | 17.6 |
| Nandinia binotata | 37.4 | 62.6 | 173 | 83 | 188 | 240 | 21.0 |
| Nanger dama | 40.4 | 59.6 | 174 | 102 | 175 | 233 | 19.3 |
| Nanger granti | 39.3 | 60.7 | 170 | 99 | 179 | 236 | 19.7 |
| Nanger soemmerringii | 40.6 | 59.4 | 175 | 103 | 173 | 233 | 15.5 |
| Nannospalax ehrenbergi | 40.5 | 59.5 | 176 | 101 | 176 | 231 | 20.2 |
| Nasalis larvatus | 38.7 | 61.3 | 177 | 88 | 201 | 218 | 25.1 |
| Nasua nasua | 41.2 | 58.8 | 180 | 102 | 179 | 223 | 23.7 |
| Neofelis nebulosa | 39.9 | 60.1 | 180 | 93 | 188 | 223 | 19.8 |
| Neomys fodiens | 36.7 | 63.3 | 157 | 94 | 197 | 236 | 3.1 |