| Species (N=919) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Aquila chrysaetos | 48.1 | 51.9 | 523 | 140 | 307 | 408 | 48.0 |
| Ara glaucogularis | 46.5 | 53.5 | 496 | 152 | 336 | 409 | 22.0 |
| Aratinga acuticaudata | 46.4 | 53.6 | 500 | 147 | 330 | 416 | 31.0 |
| Archilochus colubris | 47.6 | 52.4 | 504 | 148 | 312 | 407 | 9.1 |
| Arctica islandica | 31.0 | 69.0 | 156 | 283 | 605 | 372 | 507.0 |
| Arctocephalus pusillus | 40.7 | 59.3 | 399 | 162 | 369 | 448 | 32.1 |
| Arctonyx collaris | 38.7 | 61.3 | 386 | 147 | 391 | 454 | 15.8 |
| Ardea cinerea | 46.2 | 53.8 | 488 | 148 | 332 | 410 | 37.5 |
| Ardea purpurea | 46.5 | 53.5 | 494 | 147 | 322 | 415 | 25.4 |
| Arenaria interpres | 45.2 | 54.8 | 480 | 143 | 329 | 426 | 22.3 |
| Argyrosomus japonicus | 49.7 | 50.3 | 478 | 208 | 348 | 347 | 30.0 |
| Arripis trutta | 47.1 | 52.9 | 428 | 222 | 368 | 363 | 26.0 |
| Artibeus jamaicensis | 36.3 | 63.7 | 363 | 137 | 442 | 436 | 19.2 |
| Ateles belzebuth | 38.8 | 61.2 | 387 | 146 | 397 | 442 | 37.0 |
| Auxis thazard | 49.1 | 50.9 | 460 | 218 | 345 | 358 | 5.0 |
| Axis axis | 36.6 | 63.4 | 366 | 139 | 424 | 449 | 20.8 |
| Axis porcinus | 37.4 | 62.6 | 374 | 141 | 418 | 445 | 22.9 |
| Aythya americana | 47.8 | 52.2 | 492 | 167 | 318 | 401 | 22.6 |
| Aythya ferina | 47.9 | 52.1 | 494 | 166 | 315 | 403 | 23.2 |
| Aythya fuligula | 48.1 | 51.9 | 497 | 166 | 311 | 404 | 45.2 |
| Balaena mysticetus | 43.2 | 56.8 | 448 | 147 | 359 | 424 | 211.0 |
| Balaenoptera acutorostrata | 40.7 | 59.3 | 419 | 142 | 378 | 439 | 50.0 |
| Balaenoptera borealis | 41.6 | 58.4 | 434 | 139 | 368 | 437 | 74.0 |
| Balaenoptera edeni | 41.4 | 58.6 | 431 | 140 | 370 | 437 | 72.0 |
| Balaenoptera musculus | 41.3 | 58.7 | 427 | 142 | 377 | 432 | 110.0 |
| Balaenoptera physalus | 40.7 | 59.3 | 418 | 143 | 383 | 434 | 114.0 |
| Balearica regulorum | 44.2 | 55.8 | 466 | 138 | 327 | 437 | 27.2 |
| Barbatula barbatula | 45.2 | 54.8 | 387 | 237 | 386 | 372 | 7.0 |
| Basiliscus vittatus | 40.0 | 60.0 | 413 | 139 | 378 | 451 | 9.1 |
| Batrachuperus mustersi | 34.0 | 66.0 | 303 | 166 | 455 | 454 | 11.0 |
| Berardius bairdii | 40.4 | 59.6 | 424 | 133 | 379 | 442 | 84.0 |
| Beryx splendens | 47.7 | 52.3 | 460 | 199 | 345 | 377 | 23.0 |
| Betta splendens | 37.6 | 62.4 | 348 | 171 | 449 | 413 | 2.0 |
| Bison bison | 38.5 | 61.5 | 381 | 150 | 399 | 448 | 33.5 |
| Bison bonasus | 38.5 | 61.5 | 382 | 149 | 401 | 446 | 26.4 |
| Blanus cinereus | 43.2 | 56.8 | 459 | 134 | 333 | 448 | 16.0 |
| Boa constrictor | 38.3 | 61.7 | 381 | 138 | 342 | 495 | 40.4 |
| Bombina orientalis | 43.1 | 56.9 | 405 | 189 | 398 | 386 | 15.8 |
| Bombina variegata | 43.0 | 57.0 | 405 | 187 | 390 | 396 | 29.0 |
| Boreogadus saida | 40.6 | 59.4 | 360 | 200 | 450 | 371 | 7.0 |