Scientists May Finally Know Why T. Rex Had Such Tiny Arms

New research links T. rex’s tiny arms to the evolution of larger, stronger skulls in giant meat-eating dinosaurs.

Scientists examined 61 theropod species and found that forelimb shortening closely tracked skull robustness across several predator lineages.

The pattern suggests big predators relied more on powerful jaws as prey like sauropods got larger, while arms gradually shrank through disuse.

This provides a testable explanation for one of dinosaurs’ most iconic traits and for how feeding strategy shaped theropod evolution.