After the extinction of the dinosaurs during the Cretaceous mass extinction (the fifth mass extinction) about 66 million years ago, a new era of “megafauna” emerged. These were large animals ...

Life on Earth is anything but predictable. For evidence, look no further than the five mass extinctions that have occurred over the past 500 million years: Even in the midst of widespread ...

Roughly 201 million years ago, drastic changes extinguished many forms of life and led to conditions that allowed the ...

At the beginning of the Cretaceous Period (145 million to 66 million years ago) sharks were once again widely common and varied in the ancient seas, before experiencing their fifth mass extinction ...

Mass extinctions are defined by the loss of a large part of the biodiversity in a (geologically speaking) short span of time, when the evolution of new species can't compensate the losses.