| Name | Issues/Designs | |||
| Testudo horsfieldii | — | — | d - Testudo horsfieldii 2020 | |
| Thamnophis sirtalis | — | — | d - Thamnophis sirtalis 2006 | |
| Torosaurus | — | — | d (2) - Torosaurus (1999) 1999, etc (3), Torosaurus (2005) 2005 | |
| Triceratops | — | — | d - Triceratops (1999 Liberia) 1999, etc (2) | |
| Tropidosaura essexi | — | — | d - Tropidosaura essexi 2001 | |
| Tyrannosaurus | — | — | d (2) - Tyrannosaurus (1999 Liberia) 1999, etc (2), Tyrannosaurus (2005 Liberia) 2005 syns. T-Rex, Tyrannosaurus rex, Tyranosaurus | |
| Tyrannosaurus rex
(syn. of Tyrannosaurus) |
— | — | d - Tyrannosaurus rex 2020 | |
| Uroplatus fimbriatus | — | — | d - Uroplatus fimbriatus 1999 | |
| Velociraptor | — | — | d - Velociraptor (1999) 1999 | |
| Vipera berus
(syn. of European Adder) |
— | — | d (2) - Vipera berus (2001) 2001, Vipera berus (2020) 2020 | |
| Vipera seoanei | — | — | d - Vipera seoanei 2020 |