Dinosaurs lived on Earth for about 175 million years, until they were entirely wiped out by the K-T extinction event at the end of the Cretaceous Period. They lived during the Mesozoic Era, and examples of dinosaurs can ... More »

Dinosaurs existed during the Mesozoic Era, first appearing around 230 million years ago and dying out about 65 million years ago. However, scientists largely agree that birds are the direct descendants of dinosaurs. If s... More »

It is almost impossible to tell exactly how long dinosaurs lived, but educated guesses can be made by studying the lifespans of their descendants. This group includes modern alligators, tortoises, fish and birds. Scienti... More »

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Velociraptors were small, 30-pound, predatory dinosaurs that lived during the end of the Cretaceous Period, 85.8 million to 70.6million years ago. Fossil evidence leads scientists to believe Velociraptors, birdlike dinos... More »

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There are numerous theories regarding the extinction of the dinosaurs, including the triceratops, at the end of the Cretaceous period. The most prevalent theory describes the sudden destruction of the dinosaurs, and 50 t... More »

The purported mass dinosaur die off known as the K-Pg extinction event took place during the end of the Cretaceous Period (K) during the Mesozoic Era some 65 million years ago. This scientific theory is based on the stud... More »

The velociraptor became extinct at the end of the Cretaceous Period due to an asteroid strike at the Yucatan Peninsula that occurred roughly 65 million years ago. This extinction event, known as the K-T boundary, also ki... More »