| Species (N=919) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Aquila chrysaetos | 46.8 | 53.2 | 223 | 97 | 148 | 216 | 48.0 |
| Ara glaucogularis | 47.8 | 52.2 | 228 | 99 | 156 | 201 | 22.0 |
| Aratinga acuticaudata | 49.0 | 51.0 | 235 | 100 | 147 | 202 | 31.0 |
| Archilochus colubris | 45.0 | 55.0 | 204 | 104 | 163 | 213 | 9.1 |
| Arctica islandica | 31.1 | 68.9 | 98 | 220 | 382 | 323 | 507.0 |
| Arctocephalus pusillus | 38.4 | 61.6 | 171 | 92 | 188 | 234 | 32.1 |
| Arctonyx collaris | 37.6 | 62.4 | 165 | 92 | 196 | 231 | 15.8 |
| Ardea cinerea | 45.3 | 54.7 | 215 | 95 | 159 | 215 | 37.5 |
| Ardea purpurea | 46.6 | 53.4 | 218 | 101 | 156 | 209 | 25.4 |
| Arenaria interpres | 45.3 | 54.7 | 206 | 104 | 170 | 204 | 22.3 |
| Argyrosomus japonicus | 45.3 | 54.7 | 200 | 113 | 191 | 187 | 30.0 |
| Arripis trutta | 42.8 | 57.2 | 184 | 112 | 200 | 195 | 26.0 |
| Artibeus jamaicensis | 37.3 | 62.7 | 165 | 90 | 206 | 223 | 19.2 |
| Ateles belzebuth | 39.9 | 60.1 | 179 | 90 | 190 | 215 | 37.0 |
| Auxis thazard | 44.4 | 55.6 | 193 | 114 | 186 | 198 | 5.0 |
| Axis axis | 37.1 | 62.9 | 158 | 96 | 193 | 237 | 20.8 |
| Axis porcinus | 36.8 | 63.2 | 157 | 95 | 193 | 239 | 22.9 |
| Aythya americana | 49.2 | 50.8 | 224 | 114 | 152 | 197 | 22.6 |
| Aythya ferina | 49.6 | 50.4 | 226 | 115 | 153 | 193 | 23.2 |
| Aythya fuligula | 50.2 | 49.8 | 228 | 117 | 152 | 190 | 45.2 |
| Balaena mysticetus | 38.2 | 61.8 | 174 | 87 | 185 | 238 | 211.0 |
| Balaenoptera acutorostrata | 40.4 | 59.6 | 186 | 90 | 170 | 238 | 50.0 |
| Balaenoptera borealis | 39.9 | 60.1 | 186 | 87 | 170 | 241 | 74.0 |
| Balaenoptera edeni | 39.9 | 60.1 | 183 | 90 | 175 | 236 | 72.0 |
| Balaenoptera musculus | 40.5 | 59.5 | 188 | 89 | 170 | 237 | 110.0 |
| Balaenoptera physalus | 39.3 | 60.7 | 175 | 94 | 182 | 233 | 114.0 |
| Balearica regulorum | 45.6 | 54.4 | 215 | 97 | 162 | 210 | 27.2 |
| Barbatula barbatula | 43.4 | 56.6 | 182 | 118 | 185 | 206 | 7.0 |
| Basiliscus vittatus | 43.2 | 56.8 | 204 | 92 | 167 | 222 | 9.1 |
| Batrachuperus mustersi | 33.1 | 66.9 | 135 | 93 | 225 | 235 | 11.0 |
| Berardius bairdii | 37.9 | 62.1 | 174 | 85 | 187 | 238 | 84.0 |
| Beryx splendens | 44.4 | 55.6 | 195 | 112 | 186 | 198 | 23.0 |
| Betta splendens | 38.8 | 61.2 | 174 | 94 | 204 | 219 | 2.0 |
| Bison bison | 37.9 | 62.1 | 157 | 102 | 193 | 232 | 33.5 |
| Bison bonasus | 38.0 | 62.0 | 163 | 97 | 187 | 237 | 26.4 |
| Blanus cinereus | 44.5 | 55.5 | 209 | 96 | 154 | 226 | 16.0 |
| Boa constrictor | 44.0 | 56.0 | 177 | 125 | 152 | 233 | 40.4 |
| Bombina orientalis | 40.6 | 59.4 | 172 | 107 | 195 | 214 | 15.8 |
| Bombina variegata | 42.2 | 57.8 | 181 | 109 | 174 | 224 | 29.0 |
| Boreogadus saida | 39.4 | 60.6 | 163 | 109 | 215 | 204 | 7.0 |