Here we see Tyrannosaurus rex giving a vicious roar in front of trees.

Why did the T. rex have such small arms?

tyrannosaurus rex had a huge head and hind legs, but puny arms. There are probably several reasons for this. (Image credit: Roger Harris/Science Photo Library via Getty Images)

tyrannosaurus rex was a vicious hunter with the strongest bite of any animal that ever walked the earth. The beast was prowling the end Cretaceous desert more than 66 million years ago, in search of a Triceratops or Edemonosaur to snack.

The only thing that wasn’t threatening about the tyrant lizard king was his small arms. T. rex wasn’t the only one dinosaur with small arms compared to the rest of his body; many of its theropod cousins ​​– a group of bipedal, mostly carnivorous dinosaurs – shared this trait. But why did many theropods develop such stubby arms?

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