The nagatitan is the largest dinosaur found in South-East Asia and weighs as much as nine elephants.

Amassive T. rex known as Gus is expected to draw worldwide attention when its remarkably complete skeleton goes up for ...

The newly described mosasaur Tylosaurus rex spanned up to 43 feet (13 meters) long and may have been one of the fiercest marine predators of the dinosaur age.

Two dinosaurs fossilized in combat, originally thought to involve a juvenile Tyrannosaurus rex testing its mettle against a Triceratops, actually feature a separate species frequently confused with ...

A new study published by The Royal Society reveals the disproportionate arms of a T. rex can be linked directly to evolution.

A new study explores the reason why the dinosaur T. rex has tiny arms.

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-off.

NEW YORK — Scientists have long puzzled over the origins of a mysterious dinosaur excavated in the 1940s: Was it a young T. rex or another type of dinosaur? At first, researchers had only a ...

For decades, motorists speeding down Interstate 90 in west-central South Dakota have done double takes at a towering human skeleton leading a T. rex on ...

A new study suggests Tyrannosaurus rex’s tiny arms were the evolutionary price of developing a gigantic head and a devastating bite.

Cara Tabachnick is a news editor at CBSNews.com. Cara began her career on the crime beat at Newsday. She has written for Marie Claire, The Washington Post and The Wall Street Journal. She reports on ...