| Species (N=152) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Accipiter gentilis | 47.7 | 52.3 | 274 | 189 | 202 | 306 | 22.0 |
| Accipiter nisus | 47.9 | 52.1 | 275 | 190 | 199 | 307 | 20.2 |
| Acridotheres cristatellus | 49.0 | 51.0 | 269 | 211 | 202 | 297 | 13.0 |
| Acrocephalus scirpaceus | 49.1 | 50.9 | 267 | 213 | 196 | 301 | 14.0 |
| Aegypius monachus | 48.9 | 51.1 | 280 | 200 | 200 | 301 | 39.0 |
| Agelaius phoeniceus | 48.5 | 51.5 | 269 | 203 | 198 | 304 | 20.0 |
| Aix galericulata | 49.1 | 50.9 | 284 | 206 | 194 | 313 | 10.4 |
| Alauda arvensis | 50.1 | 49.9 | 275 | 212 | 192 | 294 | 10.1 |
| Alectura lathami | 49.0 | 51.0 | 288 | 192 | 188 | 312 | 12.5 |
| Anas acuta | 49.6 | 50.4 | 283 | 206 | 184 | 313 | 27.4 |
| Anas crecca | 49.4 | 50.6 | 280 | 208 | 188 | 312 | 27.1 |
| Anas platyrhynchos | 49.4 | 50.6 | 279 | 208 | 188 | 310 | 29.1 |
| Anser albifrons | 48.2 | 51.8 | 275 | 201 | 195 | 317 | 47.0 |
| Anser anser | 48.1 | 51.9 | 274 | 201 | 197 | 316 | 31.0 |
| Anser fabalis | 48.9 | 51.1 | 260 | 221 | 200 | 303 | 25.6 |
| Anthropoides virgo | 48.3 | 51.7 | 279 | 189 | 190 | 311 | 27.0 |
| Apus apus | 47.0 | 53.0 | 272 | 184 | 199 | 315 | 21.1 |
| Aquila chrysaetos | 50.8 | 49.2 | 286 | 206 | 184 | 292 | 48.0 |
| Ara glaucogularis | 50.1 | 49.9 | 304 | 183 | 170 | 315 | 22.0 |
| Aratinga acuticaudata | 49.5 | 50.5 | 301 | 183 | 177 | 316 | 31.0 |
| Archilochus colubris | 47.4 | 52.6 | 269 | 191 | 189 | 321 | 9.1 |
| Ardea cinerea | 47.6 | 52.4 | 267 | 196 | 197 | 312 | 37.5 |
| Ardea purpurea | 47.8 | 52.2 | 262 | 201 | 200 | 306 | 25.4 |
| Arenaria interpres | 47.3 | 52.7 | 263 | 196 | 210 | 301 | 22.3 |
| Aythya americana | 48.9 | 51.1 | 278 | 202 | 186 | 316 | 22.6 |
| Aythya ferina | 48.4 | 51.6 | 277 | 198 | 187 | 320 | 23.2 |
| Aythya fuligula | 48.2 | 51.8 | 277 | 197 | 188 | 322 | 45.2 |
| Balearica regulorum | 48.4 | 51.6 | 278 | 194 | 197 | 307 | 27.2 |
| Botaurus stellaris | 46.9 | 53.1 | 266 | 192 | 204 | 314 | 11.3 |
| Branta bernicla | 48.3 | 51.7 | 273 | 204 | 196 | 315 | 28.8 |
| Branta canadensis | 48.3 | 51.7 | 272 | 204 | 195 | 314 | 42.0 |
| Bubulcus ibis | 47.1 | 52.9 | 260 | 197 | 201 | 313 | 23.0 |
| Bucorvus leadbeateri | 48.9 | 51.1 | 276 | 201 | 196 | 303 | 70.0 |
| Buteo buteo | 48.4 | 51.6 | 279 | 191 | 205 | 297 | 28.8 |
| Cacatua moluccensis | 49.9 | 48.8 | 292 | 198 | 176 | 303 | 65.8 |
| Calyptorhynchus baudinii | 49.0 | 49.5 | 298 | 183 | 171 | 315 | 47.0 |
| Cardinalis cardinalis | 48.6 | 51.4 | 268 | 206 | 205 | 296 | 28.5 |
| Carduelis pinus | 47.6 | 52.4 | 262 | 202 | 208 | 302 | 11.0 |
| Carduelis psaltria | 47.8 | 52.2 | 263 | 203 | 203 | 305 | 5.7 |
| Carduelis spinus | 48.3 | 51.7 | 268 | 203 | 203 | 302 | 13.5 |