| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 41.1 | 58.9 | 538 | 214 | 478 | 600 | 18.2 |
| Martes martes | 41.9 | 58.1 | 541 | 225 | 478 | 586 | 18.2 |
| Martes pennanti | 41.7 | 58.3 | 536 | 228 | 480 | 586 | 14.3 |
| Martes zibellina | 41.7 | 58.3 | 535 | 229 | 482 | 584 | 18.4 |
| Mazama americana | 35.4 | 64.6 | 449 | 195 | 562 | 615 | 17.1 |
| Megaptera novaeangliae | 41.2 | 58.8 | 567 | 183 | 488 | 583 | 95.0 |
| Meles meles | 39.5 | 60.5 | 513 | 207 | 505 | 596 | 18.6 |
| Melogale moschata | 40.1 | 59.9 | 512 | 222 | 501 | 595 | 19.0 |
| Melursus ursinus | 40.0 | 60.0 | 509 | 220 | 507 | 585 | 33.3 |
| Mephitis mephitis | 35.4 | 64.6 | 454 | 194 | 545 | 637 | 13.9 |
| Meriones unguiculatus | 35.3 | 64.7 | 450 | 189 | 586 | 587 | 6.3 |
| Mesocricetus auratus | 35.5 | 64.5 | 456 | 191 | 580 | 594 | 3.9 |
| Mesoplodon europaeus | 38.7 | 61.3 | 526 | 178 | 538 | 579 | 48.0 |
| Metachirus nudicaudatus | 33.2 | 66.8 | 423 | 174 | 592 | 611 | 3.0 |
| Mogera wogura | 37.0 | 63.0 | 472 | 201 | 514 | 634 | 3.2 |
| Monodelphis domestica | 34.6 | 65.4 | 430 | 203 | 586 | 608 | 5.1 |
| Monodon monoceros | 40.7 | 59.3 | 565 | 176 | 494 | 586 | 50.0 |
| Muntiacus muntjak | 37.4 | 62.6 | 486 | 195 | 535 | 605 | 18.8 |
| Muntiacus reevesi | 37.0 | 63.0 | 476 | 197 | 541 | 607 | 23.2 |
| Mus musculus | 37.1 | 62.9 | 495 | 182 | 521 | 626 | 4.0 |
| Mustela erminea | 39.2 | 60.8 | 518 | 199 | 487 | 626 | 12.5 |
| Mustela frenata | 39.5 | 60.5 | 518 | 204 | 494 | 614 | 8.8 |
| Mustela nigripes | 39.3 | 60.7 | 504 | 211 | 494 | 612 | 9.4 |
| Mustela nivalis | 39.8 | 60.2 | 514 | 215 | 492 | 609 | 9.1 |
| Mustela putorius | 39.3 | 60.7 | 507 | 213 | 497 | 613 | 11.1 |
| Mustela sibirica | 39.3 | 60.7 | 508 | 212 | 489 | 621 | 8.8 |
| Myrmecobius fasciatus | 38.2 | 61.8 | 480 | 214 | 511 | 613 | 11.0 |
| Mystacina tuberculata | 39.0 | 61.0 | 491 | 220 | 531 | 579 | 7.6 |
| Naemorhedus baileyi | 38.7 | 61.3 | 516 | 188 | 501 | 616 | 19.0 |
| Naemorhedus caudatus | 38.7 | 61.3 | 517 | 188 | 501 | 615 | 20.3 |
| Naemorhedus goral | 39.4 | 60.6 | 523 | 194 | 497 | 607 | 17.6 |
| Nandinia binotata | 39.0 | 61.0 | 515 | 194 | 498 | 612 | 21.0 |
| Nanger dama | 39.3 | 60.7 | 514 | 202 | 510 | 595 | 19.3 |
| Nanger granti | 38.2 | 61.8 | 496 | 199 | 527 | 599 | 19.7 |
| Nanger soemmerringii | 38.8 | 61.2 | 507 | 200 | 516 | 598 | 15.5 |
| Nannospalax ehrenbergi | 37.8 | 62.2 | 515 | 175 | 490 | 647 | 20.2 |
| Nasalis larvatus | 37.0 | 63.0 | 493 | 177 | 546 | 596 | 25.1 |
| Nasua nasua | 39.2 | 60.8 | 506 | 211 | 483 | 630 | 23.7 |
| Neofelis nebulosa | 40.7 | 59.3 | 520 | 222 | 514 | 565 | 19.8 |
| Neomys fodiens | 36.5 | 63.5 | 468 | 197 | 599 | 557 | 3.1 |