The dinosaur extinction is widely known, but the end-Permian mass extinction was an even more devastating event in Earth’s history. This extinction event occurred 252 million years ago and was most ...

Both populations are adapted to high-elevation habitats without aquatic predators. So unsurprisingly, the main reason for the frogs' decline is the introduction of nonnative trout to alpine lakes.

Discovered in Patagonia, it could well redefine our understanding of the evolution of frogs. This exceptional finding sheds light on a distant aquatic past where giant tadpoles roamed the ponds of ...