Reverse genetic engineering and the fossil record both demonstrate that birds are modern feathered dinosaurs, having evolved from earlier theropods during the late Jurassic Period. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event 66 million years ago.
What are the periods of dinosaurs?
The dinosaurs went extinct 65 million years ago. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous. Each of these periods is divided into many epochs and ages. Mesozoic means "Middle Animal" and is sometimes called the age of reptiles.
What time period was the Tyrannosaurus Rex in?
T. rex lived during the late Cretaceous period, about 85 million to 65 million years ago, toward the end of the Mesozoic Era, the Age of Reptiles. During this time, the Earth was seismically active; there were many volcanic eruptions.