A new study explores the reason why the dinosaur T. rex has tiny arms.

An analysis of 85 dinosaur species shows that tiny forearms in meat-eating dinosaurs were the result of an evolutionary trade-off.

(CNN) - Scientists may have finally solved the mystery of why Tyrannosaurus rex had such tiny arms. T. rexes were 40 feet long and had a bite three times more powerful than that of a lion, according ...

A new study has found that the T. rex's arms evolved to become smaller at the same time as its head grew to catch more prey ...

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Add Yahoo as a preferred source to see more of our stories on Google. Tyrannosaurus rex lived between about 80 million and 66 million years ago. - Roger Harris/Science Photo Library/Getty Images ...