Dinosaurs lived during the Mesozoic era, between 250 and 65 million years ago. The earliest discovered dinosaur species, Nyasasaurus parringtoni, dates from 245 million years ago. Dinosaur fossils are most common between... More »

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Scientists believe that the earth looked much different during the dinosaur's lifetime than it does today; at the advent of dinosaur life, all of the landmass on earth made up one single super continent known as Pangea. ... 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 »

Dinosaurs come from the evolution of early primitive organisms approximately 230 million years ago and it is unknown why these organisms evolved into dinosaurs. Scientists have been able to trace dinosaurs back 228 milli... More »

The earliest conclusive evidence of the evolution of dinosaurs dates their origins to 230 million years ago. They are believed to have evolved from other reptilian species and developed certain defining characteristics, ... More »

The ankylosaurus became extinct with the other great dinosaurs during the Cretaceous-Paleogene extinction event that occurred about 66 million years ago. While some questions remain about what caused this extinction, geo... More »

The first true dinosaurs first appeared about 230 million years ago. The first dinosaur fossils are distinguished from those of their reptile ancestors by their more upright stance, with legs directly beneath the body in... More »

www.reference.com Pets & Animals Dinosaurs