| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 32.4 | 67.6 | 50 | 16 | 61 | 77 | 18.2 |
| Martes martes | 34.8 | 65.2 | 54 | 17 | 53 | 80 | 18.2 |
| Martes pennanti | 34.3 | 65.7 | 52 | 18 | 57 | 77 | 14.3 |
| Martes zibellina | 34.8 | 65.2 | 54 | 17 | 53 | 80 | 18.4 |
| Mazama americana | 29.4 | 70.6 | 47 | 12 | 60 | 82 | 17.1 |
| Megaptera novaeangliae | 37.0 | 63.0 | 60 | 11 | 50 | 71 | 95.0 |
| Meles meles | 28.4 | 71.6 | 45 | 13 | 59 | 87 | 18.6 |
| Melogale moschata | 31.9 | 68.1 | 46 | 19 | 62 | 77 | 19.0 |
| Melursus ursinus | 37.7 | 62.3 | 57 | 20 | 53 | 74 | 33.3 |
| Mephitis mephitis | 30.4 | 69.6 | 46 | 16 | 66 | 76 | 13.9 |
| Meriones unguiculatus | 31.9 | 68.1 | 51 | 14 | 66 | 73 | 6.3 |
| Mesocricetus auratus | 30.9 | 69.1 | 51 | 12 | 63 | 78 | 3.9 |
| Mesoplodon europaeus | 32.3 | 67.7 | 53 | 11 | 58 | 76 | 48.0 |
| Metachirus nudicaudatus | 29.5 | 70.5 | 50 | 12 | 61 | 87 | 3.0 |
| Mogera wogura | 33.8 | 66.2 | 57 | 12 | 52 | 83 | 3.2 |
| Monodelphis domestica | 31.9 | 68.1 | 50 | 17 | 56 | 87 | 5.1 |
| Monodon monoceros | 40.8 | 59.2 | 69 | 13 | 49 | 70 | 50.0 |
| Muntiacus muntjak | 31.3 | 68.7 | 51 | 12 | 56 | 82 | 18.8 |
| Muntiacus reevesi | 30.3 | 69.7 | 49 | 12 | 59 | 81 | 23.2 |
| Mus musculus | 31.9 | 68.1 | 53 | 12 | 56 | 83 | 4.0 |
| Mustela erminea | 30.9 | 69.1 | 50 | 13 | 59 | 82 | 12.5 |
| Mustela frenata | 27.9 | 72.1 | 43 | 14 | 65 | 82 | 8.8 |
| Mustela nigripes | 29.4 | 70.6 | 45 | 15 | 63 | 81 | 9.4 |
| Mustela nivalis | 30.4 | 69.6 | 47 | 15 | 62 | 80 | 9.1 |
| Mustela putorius | 29.4 | 70.6 | 46 | 14 | 62 | 82 | 11.1 |
| Mustela sibirica | 30.4 | 69.6 | 46 | 16 | 62 | 80 | 8.8 |
| Myrmecobius fasciatus | 36.7 | 63.3 | 46 | 31 | 68 | 65 | 11.0 |
| Mystacina tuberculata | 35.3 | 64.7 | 55 | 17 | 58 | 74 | 7.6 |
| Naemorhedus baileyi | 31.8 | 68.2 | 49 | 15 | 56 | 81 | 19.0 |
| Naemorhedus caudatus | 30.3 | 69.7 | 49 | 12 | 55 | 85 | 20.3 |
| Naemorhedus goral | 29.4 | 70.6 | 46 | 13 | 58 | 84 | 17.6 |
| Nandinia binotata | 31.4 | 68.6 | 52 | 12 | 55 | 85 | 21.0 |
| Nanger dama | 33.3 | 66.7 | 55 | 12 | 52 | 82 | 19.3 |
| Nanger granti | 32.8 | 67.2 | 55 | 11 | 52 | 83 | 19.7 |
| Nanger soemmerringii | 33.8 | 66.2 | 56 | 12 | 51 | 82 | 15.5 |
| Nannospalax ehrenbergi | 34.8 | 65.2 | 57 | 14 | 53 | 80 | 20.2 |
| Nasalis larvatus | 36.2 | 63.8 | 59 | 16 | 57 | 75 | 25.1 |
| Nasua nasua | 34.8 | 65.2 | 56 | 15 | 54 | 79 | 23.7 |
| Neofelis nebulosa | 34.8 | 65.2 | 50 | 21 | 58 | 75 | 19.8 |
| Neomys fodiens | 29.4 | 70.6 | 46 | 14 | 65 | 79 | 3.1 |