It’s a known fact that Tyrannosaurus rex dinosaurs have small arms — but why? Scientists now believe they have cracked the ...

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 ...

The Tyrannosaurus rex is among the most well-known dinosaurs. Huge skull, massive teeth, a body weighing tons—and then those tiny arms. Few features of the famous predator seem as odd at first ...

There’s a newly crowned T. rex. This one, called Tylosaurus rex, was a tyrant of the sea and mosasaur spanning up to 43 feet ...

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

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 ...

Some scientists have suggested a different idea: T. rex’s arms may have evolved to be smaller as another body part grew ...

Tyrannosaurus rex evolved in North America, but its direct ancestor came from Asia, crossing a land bridge connecting the continents more than 70 million years ago, according to a new study led by UCL ...