The Cretaceous–Paleogene (K–Pg) mass extinction event, marking the boundary between the Cretaceous and Paleogene periods approximately 66 million years ago, stands as one of the most profound ...

UC College of Arts and Sciences Professor Thomas Algeo has been studying the planet's five major mass extinctions since the ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. There’s an important concept in evolutionary biology called ...

Three tiny Purgatorius teeth found in Colorado are helping scientists trace how early primates evolved and spread across North America.

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...

A pair of Sacabambaspis fish, around 35 cm in length, which had distinct, forward-facing eyes and an armored head. No fossils of animals like Sacabambaspis from after the Late Ordovician Mass ...

Ancient sloths ranged in size from tiny climbers to ground-dwelling giants. Now, researchers report this body size diversity was largely shaped by sloths’ habitats, and that these animals’ precipitous ...

For decades, the asteroid that ended the reign of the dinosaurs has stood as a symbol of total planetary devastation. But hidden within the chaos it unleashed was the seed of a biological rebirth. In ...