 
			| Species (N=922) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) | 
|---|---|---|---|---|---|---|---|
| Columba livia | 45.7 | 54.3 | 672 | 497 | 552 | 838 | 35.0 | 
| Connochaetes gnou | 40.8 | 59.2 | 577 | 451 | 555 | 938 | 21.8 | 
| Connochaetes taurinus | 40.9 | 59.1 | 578 | 452 | 555 | 936 | 24.3 | 
| Coregonus clupeaformis | 49.4 | 50.6 | 685 | 611 | 520 | 810 | 50.0 | 
| Coregonus nasus | 49.5 | 50.5 | 688 | 612 | 516 | 810 | 15.0 | 
| Corvus brachyrhynchos | 45.2 | 54.8 | 627 | 539 | 566 | 848 | 20.0 | 
| Corvus cornix | 45.2 | 54.8 | 627 | 538 | 565 | 850 | 16.8 | 
| Corvus frugilegus | 45.3 | 54.7 | 625 | 542 | 566 | 843 | 22.9 | 
| Corvus hawaiiensis | 45.5 | 54.5 | 627 | 544 | 566 | 839 | 25.0 | 
| Cottus poecilopus | 47.5 | 52.5 | 686 | 566 | 555 | 827 | 8.0 | 
| Coturnix chinensis | 45.8 | 54.2 | 715 | 467 | 521 | 877 | 5.0 | 
| Coturnix japonica | 44.8 | 55.2 | 699 | 462 | 541 | 887 | 6.0 | 
| Crax rubra | 47.7 | 52.3 | 744 | 484 | 500 | 847 | 24.0 | 
| Crocidura russula | 37.3 | 62.6 | 4120 | 2303 | 5236 | 5541 | 4.0 | 
| Crocodylus acutus | 44.5 | 55.5 | 641 | 507 | 535 | 895 | 32.9 | 
| Crocodylus intermedius | 44.6 | 55.4 | 645 | 505 | 532 | 896 | 21.8 | 
| Crocodylus moreletii | 44.6 | 55.4 | 644 | 507 | 531 | 899 | 25.4 | 
| Crocodylus niloticus | 44.7 | 55.3 | 640 | 511 | 538 | 888 | 43.8 | 
| Crocodylus novaeguineae | 45.2 | 54.8 | 654 | 512 | 516 | 896 | 24.6 | 
| Crocodylus palustris | 44.7 | 55.3 | 654 | 499 | 527 | 897 | 31.5 | 
| Crocodylus porosus | 44.7 | 55.3 | 653 | 499 | 534 | 891 | 41.7 | 
| Crocodylus rhombifer | 44.9 | 55.1 | 649 | 507 | 526 | 895 | 38.2 | 
| Crocodylus siamensis | 44.8 | 55.2 | 657 | 499 | 526 | 900 | 21.9 | 
| Crocuta crocuta | 41.5 | 58.5 | 592 | 459 | 557 | 922 | 41.1 | 
| Crotalus horridus | 42.6 | 57.4 | 566 | 375 | 467 | 803 | 30.2 | 
| Ctenopharyngodon idella | 44.8 | 55.2 | 642 | 546 | 531 | 930 | 21.0 | 
| Culaea inconstans | 44.5 | 55.5 | 622 | 547 | 583 | 875 | 2.0 | 
| Cuon alpinus | 38.8 | 61.2 | 535 | 449 | 633 | 919 | 16.1 | 
| Cuora amboinensis | 40.9 | 59.1 | 617 | 436 | 550 | 969 | 38.2 | 
| Cuora flavomarginata | 39.7 | 60.3 | 589 | 427 | 570 | 976 | 19.1 | 
| Cuora trifasciata | 40.7 | 59.3 | 613 | 431 | 547 | 977 | 31.8 | 
| Cyclemys dentata | 39.5 | 60.5 | 588 | 425 | 563 | 989 | 14.7 | 
| Cycleptus elongatus | 46.6 | 53.4 | 646 | 584 | 525 | 883 | 13.0 | 
| Cygnus columbianus | 46.8 | 53.2 | 689 | 526 | 527 | 856 | 24.1 | 
| Cygnus cygnus | 46.7 | 53.3 | 689 | 524 | 530 | 856 | 26.5 | 
| Cygnus olor | 46.9 | 53.1 | 691 | 528 | 524 | 854 | 70.0 | 
| Cymatogaster aggregata | 44.9 | 55.1 | 636 | 548 | 582 | 873 | 8.0 | 
| Cynomys ludovicianus | 36.6 | 63.4 | 510 | 418 | 674 | 931 | 11.0 | 
| Cynopterus brachyotis | 40.8 | 59.2 | 560 | 475 | 570 | 934 | 10.1 | 
| Cyprinella lutrensis | 47.1 | 52.9 | 645 | 597 | 542 | 855 | 2.0 | 
