At least five groups of two-legged, mostly meat-eating theropod dinosaurs experienced a shortening of the upper arms over the course of their evolutionary journey. But why did they have such comically ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. What did the T. rex use its little arms for? – ...

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 Researchers found T. rex arms shrank as their skulls grew larger, ...

Why did T. rex have such tiny arms? Scientists now think it’s because its giant head became the ultimate hunting tool. Across multiple dinosaur groups, stronger skulls and crushing jaws evolved ...

For a new study, researchers from University College London and the University of Cambridge dug into this puzzle and found a pretty clear trend. T. rex’s arms shrank over time because its massive head ...