| Species (N=919) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Mustela erminea | 39.7 | 60.3 | 82 | 36 | 94 | 85 | 12.5 |
| Mustela frenata | 36.7 | 63.3 | 77 | 32 | 98 | 90 | 8.8 |
| Mustela nigripes | 38.0 | 62.0 | 78 | 35 | 99 | 85 | 9.4 |
| Mustela nivalis | 40.1 | 59.9 | 83 | 36 | 93 | 85 | 9.1 |
| Mustela putorius | 38.7 | 61.3 | 79 | 36 | 98 | 84 | 11.1 |
| Mustela sibirica | 39.7 | 60.3 | 83 | 35 | 93 | 86 | 8.8 |
| Mustelus griseus | 42.4 | 57.6 | 91 | 35 | 93 | 78 | 9.0 |
| Mustelus manazo | 42.1 | 57.9 | 89 | 36 | 97 | 75 | 10.0 |
| Myrmecobius fasciatus | 36.7 | 63.3 | 75 | 34 | 93 | 95 | 11.0 |
| Mystacina tuberculata | 37.7 | 62.3 | 71 | 41 | 96 | 89 | 7.6 |
| Naemorhedus baileyi | 36.7 | 63.3 | 69 | 40 | 99 | 89 | 19.0 |
| Naemorhedus caudatus | 36.0 | 64.0 | 71 | 36 | 97 | 93 | 20.3 |
| Naemorhedus goral | 37.0 | 63.0 | 74 | 36 | 94 | 93 | 17.6 |
| Naja atra | 37.8 | 62.2 | 76 | 34 | 84 | 97 | 11.7 |
| Naja naja | 37.9 | 62.1 | 76 | 34 | 84 | 96 | 32.3 |
| Nandinia binotata | 38.0 | 62.0 | 80 | 33 | 95 | 89 | 21.0 |
| Nanger dama | 35.4 | 64.6 | 70 | 35 | 96 | 96 | 19.3 |
| Nanger granti | 35.4 | 64.6 | 70 | 35 | 96 | 96 | 19.7 |
| Nanger soemmerringii | 36.0 | 64.0 | 69 | 38 | 97 | 93 | 15.5 |
| Nannospalax ehrenbergi | 35.7 | 64.3 | 75 | 31 | 97 | 94 | 20.2 |
| Nasalis larvatus | 37.4 | 62.6 | 75 | 36 | 97 | 89 | 25.1 |
| Nasua nasua | 41.1 | 58.9 | 85 | 37 | 94 | 81 | 23.7 |
| Nemipterus japonicus | 48.8 | 51.2 | 95 | 50 | 82 | 70 | 8.0 |
| Neoceratodus forsteri | 44.4 | 55.6 | 85 | 47 | 77 | 88 | 19.7 |
| Neocyttus rhomboidalis | 48.8 | 51.2 | 98 | 47 | 85 | 67 | 100.0 |
| Neofelis nebulosa | 38.0 | 62.0 | 75 | 38 | 94 | 90 | 19.8 |
| Neomys fodiens | 35.4 | 64.6 | 64 | 41 | 106 | 86 | 3.1 |
| Neophoca cinerea | 40.4 | 59.6 | 82 | 38 | 90 | 87 | 24.1 |
| Neophocaena phocaenoides | 41.1 | 58.9 | 84 | 38 | 91 | 84 | 33.0 |
| Neotragus moschatus | 37.0 | 63.0 | 71 | 39 | 95 | 92 | 13.5 |
| Neovison vison | 36.4 | 63.6 | 77 | 31 | 100 | 89 | 11.4 |
| Nerodia sipedon | 39.9 | 60.1 | 78 | 38 | 76 | 99 | 9.6 |
| Netta rufina | 50.8 | 49.2 | 103 | 48 | 70 | 76 | 8.8 |
| Nipponia nippon | 49.8 | 50.2 | 107 | 41 | 68 | 81 | 25.8 |
| Notemigonus crysoleucas | 47.8 | 52.2 | 88 | 54 | 86 | 69 | 9.0 |
| Nothobranchius furzeri | 38.4 | 61.6 | 73 | 41 | 109 | 74 | 1.1 |
| Notochelys platynota | 42.0 | 58.0 | 95 | 31 | 86 | 88 | 18.8 |
| Notorynchus cepedianus | 42.4 | 57.6 | 92 | 34 | 92 | 79 | 49.0 |
| Notropis stramineus | 48.8 | 51.2 | 93 | 52 | 84 | 68 | 3.0 |
| Nucifraga columbiana | 47.5 | 52.5 | 104 | 37 | 82 | 74 | 17.4 |