Prehistoric time line ... And 64 million years after dinosaurs went extinct, modern humans emerged in the Cenozoic era. The planet has seen an incredible series of changes—discover them for ...

3 min read At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs, pterosaurs, and giant marine reptiles were conspicuously absent from the face of the Earth. Rodent-size ...

In "Prehistoric World: Over 1,200 Incredible Mammals and Discoveries from the Mesozoic and Cenozoic," readers will learn about the warm-blooded animals that rose to prominence once the dinosaurs ...