How did Tyrannosaurus develop a robust skull and small forelimbs?

T-rex had a large skull, 1,5 meters long, built to give it a bone-crushing bite force, but it had absurdly fragile forelimbs, a mismatched combination of traits shared by many other carnivorous dinosaurs.

How did Tyrannosaurus develop a robust skull and small forelimbs?. T-rex had a large skull, 1,5 meters long, built to give it a bone-crushing bite force, but it had absurdly fragile forelimbs, a mismatched combination of traits shared by many other carnivorous dinosaurs. Scientists have identified five lineages of theropods - the bipedal group that encompasses all carnivorous dinosaurs - in which this phenomenon independently emerged, highlighting the evolutionary advantages that drove these traits. The T-rex's forelimbs have long been a subject of fascination, and online memes have emerged mocking the fearsome predator's inability to clap, scratch its nose, or do push-ups. Dinosaurs first appeared about 230 million years ago during the Triassic period, and then dominated the landscape of the Jurassic and Cretaceous periods before being w...