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We often joke about Tyrannosaurus arms.
No one knows exactly how these mighty dinosaurs used their surprisingly little limbs, although there are plenty of theories.
Tyrannosaurus rex is one of the most famous dinosaurs. This theropod lived during the Cretaceous Period, 68-66 million years ago.
The fearsome, 12-metre-long carnivore had a jaw filled with 60 teeth, each up to 20 centimetres long. Its bite was three times more powerful than that of a lion, allowing it to easily crunch through bone.
But one part of T. rex anatomy doesn't seem so frightful. This dinosaur had arms that were around one metre long, tiny when compared to the size of its body.
How T. rex used its small arms has long puzzled palaeontologists and the public. In the video above, Museum scientist Kieran Miles explains some current theories.