Famous mount Specimens of Tyrannosaurus

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scale model of never-completed tyrannosaurus rex exhibit planned american museum of natural history h.f. osborn; amnh 973 cowering individual, , amnh 5027 other individual.



morning along shore of cretaceous lake 4 [we know sixty five] million years ago. herbivorous dinosaur trachodon venturing water breakfast of succulent vegetation has been caught , partly devoured giant flesh eating tyrannosaurus. monster crouches on carcass, busy dismembering it, tyrannosaurus attracted scene. approaching, rises full height grapple more fortunate hunter , dispute prey. crouching figure reluctantly stops eating , accepts challenge, partly rising spring on adversary. psychological moment of tense inertia before combat chosen best show positions of limbs , bodies, picture incident in life history of these giant reptiles.



however, technical difficulties prevented mount being executed. 1 obvious problem cretaceous dinosaur hall small accommodate dramatic display, , amnh 5027 mounted central attraction of hall. fore-arms of tyrannosaurus not documented , hands unknown, sake of display, forearms of amnh 5027 given 3 fingers, based on forelimbs of allosaurus (the more allosaur-like arms replaced several years later when better fossils of tyrannosaurid arms found).


the mount retained rearing pose similar initial proposal. 1980s accepted such pose have been anatomically impossible in life, , skeleton re-mounted in more accurate, horizontal pose during renovation of museum s dinosaur halls in 1990s. mount can still seen on display on fourth floor of american museum.


after war, holotype of dynamosaurus imperiosus , second specimen (amnh 5881) sold , reside in collections of natural history museum, london (formerly british museum of natural history), known bmnh r7994 , bmnh r7995, respectively. american museum of natural history features amnh 5027 in famed hall of saurischian dinosaurs day.








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