The Mesozoic Era extinctions formed the world as we know it today. Read about what caused them and which animals survived.

Small fossils show mammals moved to the ground before the dinosaurs vanished. New plants changed habitats, giving better food ...

Mixodectes belonged to an extinct family known as mixodectids and lived during the Paleocene epoch. This geological epoch followed the Cretaceous-Paleogene extinction event that killed off non-avian ...

Researchers suggest that ground-based mammals fared better than their arboreal relatives during the end-Cretaceous extinction ...

But the biggest development in the seas was the appearance of whales in the mid- to late Paleogene. The huge animals evolved from land mammals that took to the seas. Meanwhile, smaller reptiles ...

It comes after the Jurassic Period and before the Paleogene - the first period of the ... released would have cooled the atmosphere. The Cretaceous extinction wiped out about 65% of all species. The ...

The so-called Cretaceous-Paleogene extinction (or K-Pg ... insurmountable barrier to survival. While this extinction ...

The anatomy of the animal's limbs and claws indicate that ... the geological epoch that followed the Cretaceous-Paleogene extinction event that killed off non-avian dinosaurs 66 million years ...

Along with sharks, many of these now-extinct species may have feasted on bottom-dwelling crustaceans ... layer of sediment or rock that geologists call the Cretaceous-Paleogene (K-Pg) boundary. The ...