• Tockus erythrorhynchus (Temminck, 1823) roodsnaveltok
  northern red-billed hornbill
  
• toermalijn (elbaiet) toermalijn (elbaïet)
  tourmaline (elbaite)
  
• Tomistoma schlegelii (Müller, 1838) onechte gaviaal
  false gharial
  
• Tonna dolium (Linnaeus, 1758) spotted tun
  geblokte tonhoren
  
• topaas topaas
  topaz
  
• Tosena fasciata (Fabricius, 1787) gestreepte zangcicade
  banded cicada
  
• Toxodera denticulata (Serville, 1837) bidsprinkhaan
  
• Trachemys scripta
• Trachemys scripta troostii Holbrook, 1836 geelwangschildpad
  Cumberland slider
  
• Trachinus draco Linnaeus, 1758 grote pieterman
  greater weever
  
• Trachyderes succinctus (Linnaeus, 1758) boktor
  longhorn beetle
  
• Trachypithecus obscurus (Reid, 1837) brillangoer
  dusky leaf monkey
  
• Tragelaphus strepsiceros (Pallas, 1766) grote koedoe
  greater kudu
  
• Tragopan blythii (Jerdon, 1870) Blyths saterhoen
  Blyth's tragopan
  
• Tragopan satyra (Linnaeus, 1758) rode saterhoen
  satyr tragopan
  
• Tragulus javanicus (Osbeck, 1765) Javaanse kleine kantjil
  Java mouse-deer
  
• Trametes gibbosa (Pers.) Fr. witte bultzwam
  
• Trametes versicolor (L.) Pilát gewoon elfenbankje
  turkeytail
  
• Treron bicinctus (Jerdon, 1840) oranjeborstpapegaaiduif
  orange-breasted green pigeon
  
• Triceratops horridus Marsh 1889 triceratops
  triceratops
  
• Trichechus manatus Linnaeus, 1758 zeekoe
  sea cow
  
• Trichius fasciatus (Linnaeus, 1758) penseelkever
  bee beetle
  
• Trictenotoma westwoodi Deyrolle, 1875 kever
  beetle
  
• Tridacna gigas (Linnaeus, 1758) doopvontschelp
  giant clam
  
• Trigonostoma apertum (Beyrich,1856)
• Trigonostoma geslini
• Trigonostoma geslini josephinae A.W. Janssen, 1984
• Tringa totanus (Linnaeus, 1758) tureluur
  common redshank
  
• Trioceros jacksonii (Boulenger, 1896) driehoornkameleon
  Jackson chameleon
  
• Trogon viridis Linnaeus, 1766 groenrugtrogon
  green-backed trogon
  
• Trogontherium cuvieri Fischer von Waldheim, 1809 reuzenbever
  giant beaver
  
• tsavoriet tsavoriet
  tsavorite
  
• Tubipora musica Linnaeus, 1758 organ pipe coral
  orgelpijpkoraal
  
• Turbinaria sp. disc coral
  steenkoraal
  
• Turbo marmoratus Linnaeus, 1758 green turban
  groene reuzentulband
  
• Turdus merula Linnaeus, 1758 merel
  common blackbird
  
• Turdus philomelos Brehm, 1831 zanglijster
  song thrush
  
• turf turf
  peat
  
• turkoois turkoois
  turquoise
  
• Turnix suscitator (Gmelin, 1789) zwartkeelvechtkwartel
  barred buttonquail
  
• Tursiops truncatus (Montagu, 1821) tuimelaar
  common bottlenose dolphin
  
• Tympanuchus cupido (Linnaeus, 1758) prairiehoen
  greater prairie chicken
  
• Typhis pungens (Solander in Brander,1766)
• Tyrannosaurus rex Osborn, 1905 tyrannosaurus
  tyrannosaurus
  
• Tyto alba (Scopoli, 1769) kerkuil
  western barn owl
  
• Uca tetragonon (Herbst, 1790) rechthoekige wenkkrab
  tetragonal fiddler crab
  
• Upupa epops Linnaeus, 1758 hop
  Eurasian hoopoe
  
• Uraeginthus granatinus (Linnaeus, 1766) granaatastrild
  violet-eared waxbill
  
• Uria aalge (Pontoppidan, 1763) zeekoet
  common murre
  
• Urocolius macrourus (Linnaeus, 1766) blauwnekmuisvogel
  blue-naped mousebird