Top Tyrannosaurus rex factsPublished19 July 2017Image source, JULIUS CSOTONYIImage caption, With a top speed of just 12mph the T. rex wasn't the fastest dinosaur - so who was? The speediest dinos were the ostrich-like ornithomimids, such as Dromiceiomimus, with speeds of up to 60km/h.Image source, PAImage caption, It might not have been the fastest, but the T. rex had the strongest bite of any land animal – it could bite prey with a force of over 3500kg – the equivalent impact of three small cars.Image source, JonathanLesageImage caption, It's not known quite what the T. rex’s short arms were for. They were too small to kill prey and too short to reach its mouth!Image caption, T. rex teeth were super scary. Like a sharp knife they had jagged edges designed to slice through meat. And unlike humans, dinosaurs could grow new teeth to replace lost ones.Image caption, Tyrannosaurus Rex means "king of the tyrant lizard."More on this storyScientists recreate T. rex bite. Video, 00:01:21Scientists recreate T. rex bitePublished29 February 20121:21New species of Tyrannosaur discovered. Video, 00:01:21New species of Tyrannosaur discoveredPublished15 March 20161:21Attenborough battles to save butterflies. Video, 00:01:15Attenborough battles to save butterfliesPublished19 July 20171:15