T-Rex Arm Size and Structure
Tyrannosaurus rex had unusually short forelimbs compared to its massive body. Adults typically had arms about 1 meter (3.3 feet) long, with two-fingered hands and robust humeri, according to the Natural History Museum.
Possible Functions of T-Rex Arms
Scientists propose several functions for T-Rex arms, including grasping prey during bites, helping the animal rise from a resting position, and gripping mates during mating. The arms were muscular and had a limited but strong range of motion.
Evolution and Related Species
Small arms evolved independently in multiple theropod lineages, including tyrannosaurs and abelisaurs. In T-Rex, arm reduction occurred alongside the development of a large skull and powerful bite, shifting feeding reliance away from the forelimbs. Research on T-Rex anatomy continues to refine these interpretations.
