Dinosaur bones have taught us a great deal about these animals from the "age of dinosaurs," the Mesozoic Era, which stretched ...

A discovery about the dark fur of early mammals confirms long-held theories about their evolutionary and ecological behavior.

During the age of dinosaurs, early mammals probably lacked the stripes and spots of their modern relatives, having uniformly dark, drab coats.

Dinosaurs have captured people’s imagination ever since their bones and teeth were first scientifically described in 1822 by ...

The largest extinction events define a change in era. The end of the Paleozoic and beginning of the Mesozoic 251 million years ago marks the largest mass extinction in the history of the planet, which ...

Non-bird dinosaurs lived between about 245 and 66 million years ago, in a time known as the Mesozoic Era. This was many millions of years before the first modern humans, Homo sapiens, appeared.