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 ...

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 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 ...

A new species of dinosaur that was four times the size of a king size bed roamed the Isle of Wight 125 million years ago, fossil analysis has revealed. Brighstoneus simmondsi is the latest in a host ...

WASHINGTON (Reuters) - Scientists in China on Wednesday described one of the weirdest flying creatures ever discovered, a pigeon-size dinosaur with wings like a bat that lived not long before the ...