| Species (N=152) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Accipiter gentilis | 46.9 | 53.0 | 660 | 193 | 393 | 571 | 22.0 |
| Accipiter nisus | 45.4 | 54.6 | 626 | 199 | 428 | 565 | 20.2 |
| Acridotheres cristatellus | 47.4 | 52.6 | 633 | 229 | 395 | 561 | 13.0 |
| Acrocephalus scirpaceus | 47.6 | 52.4 | 626 | 240 | 412 | 540 | 14.0 |
| Aegypius monachus | 46.7 | 53.3 | 640 | 209 | 411 | 558 | 39.0 |
| Agelaius phoeniceus | 46.0 | 54.0 | 632 | 205 | 408 | 573 | 20.0 |
| Aix galericulata | 49.3 | 50.7 | 649 | 251 | 378 | 546 | 10.4 |
| Alauda arvensis | 48.5 | 51.5 | 656 | 225 | 412 | 525 | 10.1 |
| Alectura lathami | 48.1 | 51.9 | 627 | 246 | 410 | 532 | 12.5 |
| Anas acuta | 49.7 | 50.3 | 650 | 257 | 390 | 527 | 27.4 |
| Anas crecca | 50.3 | 49.7 | 651 | 266 | 388 | 519 | 27.1 |
| Anas platyrhynchos | 49.8 | 50.2 | 655 | 253 | 389 | 527 | 29.1 |
| Anser albifrons | 47.3 | 52.7 | 614 | 246 | 390 | 568 | 47.0 |
| Anser anser | 47.3 | 52.7 | 617 | 243 | 389 | 569 | 31.0 |
| Anser fabalis | 46.9 | 53.1 | 615 | 238 | 390 | 575 | 25.6 |
| Anthropoides virgo | 43.7 | 56.3 | 599 | 195 | 422 | 599 | 27.0 |
| Apus apus | 45.3 | 54.7 | 630 | 193 | 420 | 572 | 21.1 |
| Aquila chrysaetos | 46.0 | 54.0 | 632 | 203 | 423 | 559 | 48.0 |
| Ara glaucogularis | 46.2 | 53.8 | 615 | 223 | 401 | 576 | 22.0 |
| Aratinga acuticaudata | 44.4 | 55.6 | 602 | 203 | 411 | 599 | 31.0 |
| Archilochus colubris | 44.7 | 55.3 | 605 | 206 | 420 | 584 | 9.1 |
| Ardea cinerea | 46.4 | 53.6 | 632 | 211 | 408 | 564 | 37.5 |
| Ardea purpurea | 46.3 | 53.7 | 625 | 215 | 415 | 560 | 25.4 |
| Arenaria interpres | 43.6 | 56.4 | 584 | 208 | 443 | 580 | 22.3 |
| Aythya americana | 48.5 | 51.5 | 634 | 250 | 396 | 544 | 22.6 |
| Aythya ferina | 49.0 | 51.0 | 642 | 252 | 389 | 541 | 23.2 |
| Aythya fuligula | 48.6 | 51.4 | 639 | 248 | 389 | 548 | 45.2 |
| Balearica regulorum | 44.1 | 55.9 | 587 | 213 | 429 | 586 | 27.2 |
| Botaurus stellaris | 44.9 | 55.1 | 624 | 191 | 405 | 595 | 11.3 |
| Branta bernicla | 47.5 | 52.5 | 613 | 253 | 398 | 560 | 28.8 |
| Branta canadensis | 47.3 | 52.7 | 616 | 246 | 393 | 569 | 42.0 |
| Bubulcus ibis | 45.6 | 54.4 | 632 | 195 | 407 | 581 | 23.0 |
| Bucorvus leadbeateri | 47.7 | 52.3 | 653 | 212 | 380 | 570 | 70.0 |
| Buteo buteo | 47.0 | 53.0 | 657 | 198 | 401 | 562 | 28.8 |
| Cacatua moluccensis | 46.7 | 53.3 | 621 | 226 | 401 | 567 | 65.8 |
| Calyptorhynchus baudinii | 42.8 | 56.7 | 567 | 209 | 435 | 595 | 47.0 |
| Cardinalis cardinalis | 44.0 | 55.9 | 590 | 210 | 470 | 546 | 28.5 |
| Carduelis pinus | 46.0 | 54.0 | 628 | 208 | 420 | 562 | 11.0 |
| Carduelis psaltria | 45.3 | 54.7 | 619 | 205 | 433 | 561 | 5.7 |
| Carduelis spinus | 46.0 | 54.0 | 634 | 203 | 414 | 567 | 13.5 |