Non-bird dinosaurs ... time known as the Mesozoic Era. This was many millions of years before the first modern humans, Homo sapiens, appeared. Scientists divide the Mesozoic Era into three periods: ...

In the Permian period before ... time the earliest dinosaurs appeared. The Permian period’s mass extinction had wiped out the mammals that could have been competitors for these reptiles on land ...

Before the discovery ... newt rather than carnivorous dinosaurs. This implied that these creatures similar to their present-day counterparts could live in land and water. Researchers were ecstatic ...