| Species (N=919) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Trichechus manatus | 43.5 | 56.5 | 105 | 46 | 94 | 102 | 65.0 |
| Trichiurus lepturus | 47.9 | 52.1 | 113 | 54 | 109 | 73 | 15.0 |
| Trichosurus vulpecula | 40.2 | 59.8 | 100 | 40 | 106 | 102 | 15.9 |
| Trimeresurus albolabris | 39.9 | 60.1 | 100 | 37 | 92 | 114 | 11.4 |
| Trinectes maculatus | 49.3 | 50.7 | 117 | 55 | 98 | 79 | 6.0 |
| Trionyx triunguis | 41.7 | 58.3 | 109 | 37 | 86 | 118 | 50.6 |
| Triturus carnifex | 45.4 | 54.6 | 101 | 57 | 103 | 87 | 11.0 |
| Triturus cristatus | 44.5 | 55.5 | 102 | 53 | 103 | 90 | 28.0 |
| Triturus marmoratus | 43.1 | 56.9 | 102 | 48 | 103 | 95 | 25.0 |
| Tropidophis haetianus | 38.8 | 61.2 | 91 | 42 | 98 | 112 | 15.3 |
| Tupaia belangeri | 43.8 | 56.2 | 105 | 47 | 91 | 104 | 11.1 |
| Turdus migratorius | 39.6 | 38.2 | 88 | 51 | 70 | 64 | 17.0 |
| Tursiops truncatus | 38.4 | 61.6 | 96 | 37 | 105 | 108 | 51.6 |
| Tylototriton verrucosus | 41.9 | 58.1 | 96 | 49 | 101 | 100 | 11.0 |
| Uncia uncia | 41.5 | 58.5 | 103 | 41 | 94 | 109 | 21.2 |
| Urocyon cinereoargenteus | 40.2 | 59.8 | 88 | 51 | 102 | 105 | 16.2 |
| Ursus americanus | 42.4 | 57.6 | 96 | 51 | 102 | 98 | 34.0 |
| Ursus arctos | 42.4 | 57.6 | 95 | 52 | 103 | 97 | 40.0 |
| Ursus maritimus | 41.9 | 58.1 | 95 | 50 | 103 | 98 | 43.8 |
| Ursus thibetanus | 41.5 | 58.5 | 95 | 49 | 102 | 101 | 39.2 |
| Vanellus vanellus | 44.0 | 56.0 | 115 | 40 | 92 | 105 | 24.5 |
| Varanus niloticus | 44.5 | 55.5 | 109 | 45 | 99 | 93 | 14.6 |
| Varanus salvator | 43.9 | 56.1 | 111 | 41 | 94 | 100 | 15.7 |
| Varecia variegata | 37.6 | 62.4 | 96 | 35 | 102 | 115 | 37.0 |
| Vestiaria coccinea | 44.7 | 55.3 | 115 | 42 | 88 | 106 | 8.8 |
| Vicugna vicugna | 38.0 | 62.0 | 92 | 40 | 113 | 102 | 31.6 |
| Vireo olivaceus | 44.4 | 55.6 | 113 | 43 | 83 | 112 | 10.2 |
| Vombatus ursinus | 37.9 | 62.1 | 93 | 40 | 111 | 107 | 30.0 |
| Vulpes corsac | 41.9 | 58.1 | 99 | 46 | 94 | 107 | 13.0 |
| Vulpes lagopus | 45.5 | 54.5 | 101 | 57 | 94 | 95 | 16.3 |
| Vulpes vulpes | 39.2 | 60.8 | 91 | 45 | 106 | 105 | 21.3 |
| Vulpes zerda | 39.2 | 60.8 | 91 | 45 | 106 | 105 | 16.3 |
| Xenomystus nigri | 47.4 | 52.6 | 110 | 54 | 96 | 86 | 11.4 |
| Xenopeltis unicolor | 37.9 | 62.1 | 92 | 38 | 100 | 113 | 12.1 |
| Xenopus laevis | 39.9 | 60.1 | 90 | 47 | 116 | 90 | 30.3 |
| Zaglossus bruijni | 41.4 | 58.6 | 94 | 50 | 113 | 91 | 41.2 |
| Zalophus californianus | 41.0 | 59.0 | 101 | 41 | 92 | 112 | 35.7 |
| Zeus faber | 44.1 | 55.9 | 104 | 50 | 112 | 83 | 12.0 |
| Ziphius cavirostris | 38.3 | 61.7 | 97 | 36 | 100 | 114 | 62.0 |