rex's bite force was stronger than the bite force in most extinct animals (but not all). rex didn't have the smallest arm-to-body ratio among carnivorous. rex's arms were over three feet long, however, and may have been capable of bench pressing 400 pounds each. 9, 2020.Įditor's note: This story was updated to reflect that T. One feature of Tyrannosaurus rex that everyone makes fun of is its arms, which seem disproportionately tiny compared to the rest of its massive body. rex: The Ultimate Predator is on display at the AMNH from March 11, 2019, to Aug. "Its head was adapted to apply pressure until bones just exploded," Schwabacher said. rex probably didn't need to do much with its arms to subdue a meal. But with a bite force estimated at 7,800 pounds-force (34,500 newtons) - the strongest of any living animal and most extinct animals - T. rex also may have used its arms and claws to slash at prey that it had already knocked down with its massive head and jaws, Schwabacher said. (Image credit: Illustration by Zhao Chuang, courtesy of PNSO)Īdult T. rex weighed about 6 to 9 tons (5,500 to 8,000 kilograms). rexes may have been able to use their arms to grasp prey, as other small tyrannosaurs likely did.Ī full-grown T. rex hatchlings, the proportions of their arms were a much better match to their body size, which means that very young T. "They're not fragile the bones are very robust, the joints are mobile and it looks like they were well-muscled," Schwabacher said. rex model are even smaller than they've been portrayed in the past, Norell said. And based on the few fossil arms that paleontologists have recently discovered, the puny arms on the exhibit's adult T. rex has long been known to have dramatically undersized "arms" for its body size, few of this species' front limbs have been recovered from the fossil record, Norell told Live Science. (3 kg) per day for 13 years, said paleontologist Mark Norell, curator of both the exhibit and the Division of Paleontology at the AMNH. Finnin)ĭuring their rapid growth, juveniles would gain about 6 lbs.
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