| Species (N=152) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Accipiter gentilis | 47.8 | 52.2 | 203 | 45 | 66 | 205 | 22.0 |
| Accipiter nisus | 47.6 | 52.4 | 199 | 48 | 64 | 208 | 20.2 |
| Acridotheres cristatellus | 49.7 | 50.3 | 201 | 57 | 67 | 194 | 13.0 |
| Acrocephalus scirpaceus | 49.9 | 50.1 | 199 | 60 | 58 | 202 | 14.0 |
| Aegypius monachus | 49.5 | 50.5 | 203 | 54 | 66 | 196 | 39.0 |
| Agelaius phoeniceus | 50.1 | 49.9 | 211 | 49 | 60 | 199 | 20.0 |
| Aix galericulata | 49.2 | 50.8 | 198 | 59 | 61 | 204 | 10.4 |
| Alauda arvensis | 48.6 | 51.4 | 195 | 57 | 69 | 198 | 10.1 |
| Alectura lathami | 48.1 | 51.9 | 196 | 55 | 64 | 207 | 12.5 |
| Anas acuta | 52.6 | 47.4 | 203 | 71 | 52 | 195 | 27.4 |
| Anas crecca | 50.6 | 49.4 | 199 | 65 | 58 | 200 | 27.1 |
| Anas platyrhynchos | 50.8 | 49.2 | 198 | 67 | 58 | 199 | 29.1 |
| Anser albifrons | 51.5 | 48.5 | 206 | 63 | 52 | 201 | 47.0 |
| Anser anser | 50.4 | 49.6 | 206 | 57 | 52 | 207 | 31.0 |
| Anser fabalis | 51.4 | 48.6 | 198 | 64 | 54 | 194 | 25.6 |
| Anthropoides virgo | 47.9 | 52.1 | 201 | 49 | 59 | 213 | 27.0 |
| Apus apus | 47.5 | 52.5 | 197 | 51 | 61 | 213 | 21.1 |
| Aquila chrysaetos | 49.5 | 50.5 | 207 | 50 | 61 | 201 | 48.0 |
| Ara glaucogularis | 48.3 | 51.7 | 191 | 57 | 47 | 218 | 22.0 |
| Aratinga acuticaudata | 47.6 | 52.4 | 188 | 56 | 52 | 217 | 31.0 |
| Archilochus colubris | 46.6 | 53.4 | 184 | 59 | 70 | 209 | 9.1 |
| Ardea cinerea | 44.6 | 55.4 | 182 | 51 | 69 | 220 | 37.5 |
| Ardea purpurea | 48.1 | 51.9 | 195 | 56 | 58 | 213 | 25.4 |
| Arenaria interpres | 44.3 | 55.7 | 184 | 47 | 70 | 221 | 22.3 |
| Aythya americana | 50.6 | 49.4 | 202 | 62 | 51 | 207 | 22.6 |
| Aythya ferina | 50.5 | 49.5 | 201 | 62 | 51 | 207 | 23.2 |
| Aythya fuligula | 50.4 | 49.6 | 201 | 62 | 53 | 206 | 45.2 |
| Balearica regulorum | 47.7 | 52.3 | 199 | 50 | 59 | 214 | 27.2 |
| Botaurus stellaris | 46.6 | 53.4 | 192 | 51 | 66 | 213 | 11.3 |
| Branta bernicla | 49.6 | 50.4 | 195 | 64 | 61 | 202 | 28.8 |
| Branta canadensis | 50.8 | 49.2 | 203 | 62 | 55 | 202 | 42.0 |
| Bubulcus ibis | 47.1 | 52.9 | 191 | 55 | 58 | 218 | 23.0 |
| Bucorvus leadbeateri | 49.2 | 50.8 | 203 | 54 | 52 | 213 | 70.0 |
| Buteo buteo | 49.5 | 50.5 | 204 | 53 | 64 | 198 | 28.8 |
| Cacatua moluccensis | 50.3 | 47.2 | 185 | 76 | 58 | 187 | 65.8 |
| Calyptorhynchus baudinii | 46.1 | 53.9 | 174 | 65 | 68 | 212 | 47.0 |
| Cardinalis cardinalis | 47.8 | 51.8 | 197 | 51 | 70 | 199 | 28.5 |
| Carduelis pinus | 48.6 | 51.4 | 209 | 43 | 55 | 212 | 11.0 |
| Carduelis psaltria | 48.2 | 51.8 | 205 | 45 | 59 | 210 | 5.7 |
| Carduelis spinus | 47.6 | 52.4 | 203 | 44 | 62 | 210 | 13.5 |