Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Gano samfurori da yawa a matsayin matasa Tyrannosaurus rex ya ba masana kimiyya damar yin rikodin canje-canje na ontogenetic a cikin jinsunan, kimanta tsawon rai, da kuma ƙayyade yadda dabbobi za su yi girma da sauri. An kiyasta mafi ƙarancin mutum da aka sani (LACM 28471, "Jordan theropod") ya kai kilo 30 (66 lb), yayin da mafi girma, kamar FMNH PR2081 (Sue) mai yiwuwa ya kai kimanin kilo 5,650. Nazarin ilimin lissafi na Tyrannosaurus rex ƙasusuwa ya nuna LACM 28471 ya tsufa ne kawai shekaru 2 lokacin da ya mutu, yayin da Sue ke da shekaru 28, shekarun da zai iya kasancewa kusa da iyakar ga jinsin.Histology ya kuma ba da damar ƙayyade shekarun wasu samfurori. Za a iya haɓaka ƙwanƙolin girma lokacin da aka zana shekarun nau'ikan daban-daban a kan jadawalin tare da nauyin su. Girman girma na Tyrannosaurus rex yana da siffar S, tare da matasan da suka rage a karkashin 1,800 kg (4,000 lb) har zuwa kimanin shekaru 14, lokacin da girman jiki ya fara karuwa sosai. A lokacin wannan saurin girma, wani matashi Tyrannosaurus rex zai sami matsakaicin kilo 600 a shekara don shekaru hudu masu zuwa. Sa'ad da mutum ya kai shekara 18, sai ƙwanƙolin ya sake daidaitawa, hakan ya nuna cewa ba ya girma da sauri. Misali, kilogiram 600 ne kawai ya raba Sue mai shekaru 28 daga samfurin Kanada mai shekaru 22 (RTMP 81.12.1). Nazarin ilimin lissafi na 2004 da ma'aikata daban-daban suka gudanar ya tabbatar da waɗannan sakamakon, yana gano cewa saurin girma ya fara raguwa a kusan shekaru 16.  Tambaya: Wane irin dabba ne masana kimiyya suka yi nazari a kai don su san yadda suke girma da sauri?
matashin Tyrannosaurus rex