 
			| Species (N=922) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) | 
|---|---|---|---|---|---|---|---|
| Columba livia | 44.0 | 56.0 | 402 | 278 | 379 | 485 | 35.0 | 
| Connochaetes gnou | 37.0 | 63.0 | 325 | 234 | 416 | 537 | 21.8 | 
| Connochaetes taurinus | 36.8 | 63.2 | 326 | 230 | 415 | 541 | 24.3 | 
| Coregonus clupeaformis | 46.3 | 53.7 | 393 | 327 | 386 | 450 | 50.0 | 
| Coregonus nasus | 46.2 | 53.8 | 395 | 324 | 385 | 452 | 15.0 | 
| Corvus brachyrhynchos | 40.9 | 59.1 | 363 | 267 | 400 | 512 | 20.0 | 
| Corvus cornix | 40.6 | 59.4 | 363 | 268 | 404 | 521 | 16.8 | 
| Corvus frugilegus | 40.5 | 59.5 | 360 | 265 | 401 | 518 | 22.9 | 
| Corvus hawaiiensis | 40.5 | 59.5 | 360 | 265 | 398 | 521 | 25.0 | 
| Cottus poecilopus | 46.6 | 53.4 | 396 | 327 | 368 | 460 | 8.0 | 
| Coturnix chinensis | 42.9 | 57.1 | 394 | 269 | 375 | 509 | 5.0 | 
| Coturnix japonica | 42.4 | 57.6 | 382 | 273 | 381 | 508 | 6.0 | 
| Crax rubra | 43.8 | 56.2 | 405 | 271 | 380 | 488 | 24.0 | 
| Crocidura russula | 35.8 | 64.2 | 308 | 230 | 444 | 522 | 4.0 | 
| Crocodylus acutus | 42.5 | 57.5 | 380 | 276 | 397 | 492 | 32.9 | 
| Crocodylus intermedius | 42.7 | 57.3 | 380 | 279 | 396 | 490 | 21.8 | 
| Crocodylus moreletii | 43.0 | 56.9 | 384 | 281 | 392 | 488 | 25.4 | 
| Crocodylus niloticus | 42.8 | 57.2 | 382 | 282 | 395 | 491 | 43.8 | 
| Crocodylus novaeguineae | 43.2 | 56.8 | 388 | 280 | 390 | 487 | 24.6 | 
| Crocodylus palustris | 43.3 | 56.7 | 384 | 283 | 390 | 483 | 31.5 | 
| Crocodylus porosus | 43.7 | 56.3 | 3134 | 1685 | 2782 | 3423 | 41.7 | 
| Crocodylus rhombifer | 42.8 | 57.2 | 382 | 279 | 395 | 487 | 38.2 | 
| Crocodylus siamensis | 43.0 | 57.0 | 387 | 277 | 396 | 483 | 21.9 | 
| Crocuta crocuta | 38.9 | 61.1 | 345 | 244 | 406 | 520 | 41.1 | 
| Crotalus horridus | 41.4 | 58.6 | 357 | 233 | 358 | 477 | 30.2 | 
| Ctenopharyngodon idella | 43.7 | 56.3 | 374 | 307 | 400 | 479 | 21.0 | 
| Culaea inconstans | 45.4 | 54.6 | 386 | 315 | 371 | 471 | 2.0 | 
| Cuon alpinus | 35.4 | 64.6 | 301 | 230 | 461 | 510 | 16.1 | 
| Cuora amboinensis | 38.5 | 61.5 | 351 | 245 | 410 | 541 | 38.2 | 
| Cuora flavomarginata | 37.6 | 62.4 | 343 | 240 | 415 | 552 | 19.1 | 
| Cuora trifasciata | 38.6 | 61.4 | 355 | 243 | 407 | 545 | 31.8 | 
| Cyclemys dentata | 37.4 | 62.4 | 345 | 234 | 417 | 549 | 14.7 | 
| Cycleptus elongatus | 44.8 | 55.2 | 381 | 319 | 398 | 466 | 13.0 | 
| Cygnus columbianus | 43.1 | 56.9 | 395 | 266 | 370 | 502 | 24.1 | 
| Cygnus cygnus | 43.3 | 56.7 | 396 | 269 | 372 | 499 | 26.5 | 
| Cygnus olor | 42.4 | 57.6 | 393 | 261 | 381 | 508 | 70.0 | 
| Cymatogaster aggregata | 43.7 | 56.3 | 383 | 296 | 394 | 482 | 8.0 | 
| Cynomys ludovicianus | 35.6 | 64.4 | 308 | 229 | 455 | 518 | 11.0 | 
| Cynopterus brachyotis | 38.4 | 61.6 | 336 | 245 | 411 | 522 | 10.1 | 
| Cyprinella lutrensis | 46.1 | 53.9 | 384 | 335 | 387 | 455 | 2.0 | 
