| Species (N=919) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Aquila chrysaetos | 46.6 | 53.4 | 248 | 71 | 166 | 199 | 48.0 |
| Ara glaucogularis | 46.2 | 53.8 | 246 | 70 | 166 | 202 | 22.0 |
| Aratinga acuticaudata | 46.5 | 53.5 | 254 | 64 | 160 | 206 | 31.0 |
| Archilochus colubris | 45.2 | 54.8 | 238 | 71 | 176 | 199 | 9.1 |
| Arctica islandica | 31.9 | 68.1 | 77 | 160 | 324 | 183 | 507.0 |
| Arctocephalus pusillus | 41.6 | 58.4 | 205 | 78 | 189 | 209 | 32.1 |
| Arctonyx collaris | 38.5 | 61.5 | 188 | 74 | 205 | 214 | 15.8 |
| Ardea cinerea | 47.7 | 52.3 | 255 | 71 | 153 | 205 | 37.5 |
| Ardea purpurea | 46.9 | 53.1 | 255 | 66 | 154 | 209 | 25.4 |
| Arenaria interpres | 45.5 | 54.5 | 245 | 66 | 185 | 188 | 22.3 |
| Argyrosomus japonicus | 49.0 | 51.0 | 239 | 96 | 188 | 161 | 30.0 |
| Arripis trutta | 46.7 | 53.3 | 226 | 93 | 197 | 167 | 26.0 |
| Artibeus jamaicensis | 36.0 | 64.0 | 173 | 72 | 224 | 212 | 19.2 |
| Ateles belzebuth | 38.3 | 61.7 | 196 | 65 | 199 | 221 | 37.0 |
| Auxis thazard | 47.4 | 52.6 | 227 | 97 | 186 | 174 | 5.0 |
| Axis axis | 36.6 | 63.4 | 170 | 79 | 215 | 217 | 20.8 |
| Axis porcinus | 38.5 | 61.5 | 177 | 85 | 209 | 210 | 22.9 |
| Aythya americana | 48.4 | 51.6 | 253 | 78 | 159 | 194 | 22.6 |
| Aythya ferina | 48.2 | 51.8 | 253 | 77 | 159 | 195 | 23.2 |
| Aythya fuligula | 48.7 | 51.3 | 254 | 79 | 159 | 192 | 45.2 |
| Balaena mysticetus | 40.2 | 59.8 | 211 | 63 | 186 | 221 | 211.0 |
| Balaenoptera acutorostrata | 38.5 | 61.5 | 195 | 67 | 201 | 218 | 50.0 |
| Balaenoptera borealis | 38.3 | 61.7 | 192 | 69 | 208 | 212 | 74.0 |
| Balaenoptera edeni | 39.1 | 60.9 | 198 | 68 | 201 | 214 | 72.0 |
| Balaenoptera musculus | 38.3 | 61.7 | 194 | 67 | 202 | 218 | 110.0 |
| Balaenoptera physalus | 38.9 | 61.1 | 194 | 71 | 200 | 216 | 114.0 |
| Balearica regulorum | 45.2 | 54.8 | 247 | 62 | 157 | 218 | 27.2 |
| Barbatula barbatula | 42.7 | 57.3 | 189 | 103 | 198 | 194 | 7.0 |
| Basiliscus vittatus | 41.7 | 58.3 | 209 | 76 | 191 | 207 | 9.1 |
| Batrachuperus mustersi | 31.0 | 69.0 | 140 | 72 | 243 | 229 | 11.0 |
| Berardius bairdii | 38.5 | 61.5 | 193 | 69 | 202 | 217 | 84.0 |
| Beryx splendens | 48.2 | 51.8 | 234 | 95 | 180 | 174 | 23.0 |
| Betta splendens | 34.5 | 65.5 | 157 | 79 | 251 | 197 | 2.0 |
| Bison bison | 38.3 | 61.7 | 185 | 76 | 192 | 228 | 33.5 |
| Bison bonasus | 38.9 | 61.1 | 187 | 78 | 194 | 222 | 26.4 |
| Blanus cinereus | 43.2 | 56.8 | 214 | 80 | 179 | 208 | 16.0 |
| Boa constrictor | 39.0 | 61.0 | 185 | 80 | 175 | 240 | 40.4 |
| Bombina orientalis | 41.5 | 58.5 | 201 | 83 | 205 | 195 | 15.8 |
| Bombina variegata | 41.2 | 58.8 | 196 | 86 | 213 | 189 | 29.0 |
| Boreogadus saida | 38.9 | 61.1 | 180 | 86 | 240 | 177 | 7.0 |