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How long were dinosaurs on earth?

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How long were dinosaurs on Earth. Dinosaurs were on Earth for between 165 & 177 million years from the mid Triassic to the end of the Cretaceous period. read more

Dinosaurs' long reign on Earth may have had more to do with lady luck than with superiority, according to a study published today in Science. The study challenges the old notion that dinosaurs out-competed their reptilian contemporaries. It is a longstanding mystery why dinosaurs became and remained so plentiful for more than 180 million years. read more

Still, the idea that non-avian dinosaurs were uniformly gigantic is a misconception based in part on preservation bias, as large, sturdy bones are more likely to last until they are fossilized. Many dinosaurs were quite small: Xixianykus, for example, was only about 50 cm (20 in) long. read more

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