May 29 (Reuters) - Tyrannosaurus rex possessed a preposterously massive skull - 5 feet long (1.5 meters) and built to enable bone-crunching bite force - but presented preposterously puny arms. And ...

Tyrannosaurus rex may have taken far longer to grow up than scientists once thought. By analyzing growth rings in fossilized leg bones from 17 tyrannosaur specimens and using new statistical methods, ...

These traits seen in five lineages of meat-eating dinosaurs Increased size of prey led to more massive theropod skulls With bigger skulls, arms became less useful for hunting Arm reduction started as ...