Tyrannosaurus rex lived longer and took more time to reach its maximum size than previously thought, according to a new study.

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Tyrannosaurus rex. The name conjures up a ...

WASHINGTON, Jan 11 (Reuters) - Scientists reassessing a partial skull first unearthed in 1983 in southeastern New Mexico have concluded that the fossil represents a new species of Tyrannosaurus - the ...

Since its discovery in 1902, there’s only been one known type of Tyrannosaurus: the rex. However, a new study says there were three types of Tyrannosaurus, based on differences in fossils' femurs and ...