Earth was once ruled by giant reptiles. Tyrannosaurus rex, the king of tyrant lizards, crushed bones. Spinosaurus hunted in ...

a treasure from the Permian era has emerged. The remains of the oldest gorgonopsian ever discovered unveil the secrets of a formidable predator, at the crossroads between reptiles and mammals.

The Jurassic Era was when giant plant-eating and smaller carnivorous dinosaurs emerged. Reptiles gained the ability to fly ...

and the Mesozoic Era, when the archosaurian reptiles, which includes the dinosaurs, came to dominate.' The cause of the Permian-Triassic extinction event is not fully understood. Various theories have ...

Rates of evolution (adaptive anatomical changes) in reptiles start increasing early in the Permian (at about 294 million years ago), which also marks the onset of the longest period of successive ...

and sea urchins that survived the Permian extinction and were quickly diversifying. The first corals appeared, though other reef-building organisms were already present. Giant reptiles such as the ...