| Species (N=922) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Aquila chrysaetos | 42.9 | 57.1 | 398 | 266 | 379 | 505 | 48.0 |
| Ara glaucogularis | 43.7 | 56.3 | 400 | 269 | 366 | 495 | 22.0 |
| Aratinga acuticaudata | 42.6 | 57.3 | 398 | 256 | 375 | 504 | 31.0 |
| Archilochus colubris | 42.3 | 57.5 | 396 | 260 | 379 | 511 | 9.1 |
| Arctica islandica | 33.6 | 66.4 | 180 | 296 | 499 | 441 | 507.0 |
| Arctocephalus pusillus | 39.1 | 60.9 | 347 | 247 | 396 | 530 | 32.1 |
| Arctonyx collaris | 36.2 | 63.8 | 312 | 234 | 427 | 534 | 15.8 |
| Ardea cinerea | 41.8 | 58.2 | 405 | 273 | 409 | 534 | 37.5 |
| Ardea purpurea | 42.6 | 57.4 | 415 | 274 | 399 | 531 | 25.4 |
| Arenaria interpres | 42.0 | 58.0 | 393 | 262 | 400 | 505 | 22.3 |
| Argyrosomus japonicus | 45.4 | 54.6 | 388 | 316 | 376 | 470 | 30.0 |
| Arripis trutta | 45.0 | 55.0 | 377 | 322 | 392 | 461 | 26.0 |
| Artibeus jamaicensis | 36.2 | 63.8 | 308 | 239 | 432 | 532 | 19.2 |
| Ateles belzebuth | 36.4 | 63.6 | 320 | 228 | 429 | 527 | 37.0 |
| Auxis thazard | 45.5 | 54.5 | 390 | 315 | 382 | 463 | 5.0 |
| Axis axis | 36.0 | 64.0 | 310 | 236 | 428 | 541 | 20.8 |
| Axis porcinus | 35.3 | 64.7 | 308 | 227 | 430 | 551 | 22.9 |
| Aythya americana | 43.9 | 56.1 | 397 | 280 | 377 | 487 | 22.6 |
| Aythya ferina | 43.7 | 56.3 | 395 | 279 | 381 | 487 | 23.2 |
| Aythya fuligula | 43.5 | 56.5 | 395 | 275 | 378 | 493 | 45.2 |
| Balaena mysticetus | 36.2 | 63.8 | 321 | 228 | 431 | 537 | 211.0 |
| Balaenoptera acutorostrata | 37.3 | 62.7 | 338 | 230 | 420 | 535 | 50.0 |
| Balaenoptera borealis | 36.4 | 63.6 | 324 | 230 | 430 | 539 | 74.0 |
| Balaenoptera edeni | 36.8 | 63.2 | 328 | 232 | 425 | 537 | 72.0 |
| Balaenoptera musculus | 36.5 | 63.5 | 323 | 232 | 429 | 537 | 110.0 |
| Balaenoptera physalus | 36.8 | 63.2 | 323 | 237 | 428 | 533 | 114.0 |
| Balearica regulorum | 43.0 | 57.0 | 403 | 264 | 374 | 511 | 27.2 |
| Barbatula barbatula | 45.0 | 55.0 | 380 | 319 | 395 | 459 | 7.0 |
| Basiliscus vittatus | 41.1 | 58.9 | 379 | 253 | 385 | 520 | 9.1 |
| Batrachuperus mustersi | 36.0 | 64.0 | 309 | 240 | 456 | 522 | 11.0 |
| Berardius bairdii | 37.9 | 62.1 | 338 | 235 | 410 | 528 | 84.0 |
| Beryx splendens | 45.0 | 55.0 | 391 | 309 | 383 | 471 | 23.0 |
| Betta splendens | 41.5 | 58.5 | 369 | 277 | 400 | 509 | 2.0 |
| Bison bison | 36.6 | 63.4 | 327 | 226 | 427 | 531 | 33.5 |
| Bison bonasus | 36.6 | 63.4 | 319 | 230 | 427 | 522 | 26.4 |
| Blanus cinereus | 46.0 | 54.0 | 413 | 278 | 347 | 463 | 16.0 |
| Boa constrictor | 41.2 | 58.8 | 356 | 249 | 360 | 502 | 40.4 |
| Bombina orientalis | 43.7 | 56.3 | 383 | 287 | 389 | 475 | 15.8 |
| Bombina variegata | 44.6 | 55.4 | 387 | 296 | 381 | 469 | 29.0 |
| Boreogadus saida | 46.0 | 54.0 | 387 | 322 | 375 | 456 | 7.0 |