We know dinosaurs were big, but how big were they? And how do we even know? Luckily, paleontologists and other scientists know how to find the answers. By measuring fossils, comparing them to the ...

The meat-eating dinosaurs known as theropods that roamed the ancient Earth ranged in size from the bus-sized T. rex to the smaller, dog-sized Velociraptor. Scientists puzzling over how such wildly ...

SYDNEY (Reuters) — Scientists have confirmed the discovery of a new dinosaur species in Australia, one of the largest found in the world, more than a decade after cattle farmers first uncovered bones ...

Dinosaurs were not only the largest animals to roam the Earth -- they also had a greater number of larger species compared to all other back-boned animals -- scientists suggest in a new article.

Scientists have discovered a species of dinosaur that roamed between Australia and Antarctica 113 million years ago. The discovery of Diluvicursor pickeringi, published Thursday in the biological and ...

Fossils found in Chile are from a strange-looking dog-sized dinosaur species that had a unique slashing tail weapon, scientists reported Wednesday. Some dinosaurs had spiked tails they could use as ...

A species of dinosaur recently discovered in Argentina had an armored back, distinctive jaw and tiny arms — and was roughly the size of a dog. Fossils dated to the humid Late Cretaceous period — ...

Scientists have discovered a species that they say is the oldest carnivorous dinosaur found in the U.K. — a chicken-size relative of Tyrannosaurus rex called Pendraig milnerae. According to an article ...

Sometime during the Cretaceous Period, 125 million years ago, a feisty mammal the size of a domestic cat encountered a dinosaur three times its size and thought it looked like a tasty meal. A fossil ...

A savage meat-eating dinosaur the size of a bus that slashed its prey to death has been recognised as a new species 30 years after its remains were dug up in Utah. Scientists uncovered remains of the ...