There definitely were no muppets during the Permian Period, but there was a Kermit – or at least a forerunner of modern amphibians that has been named after the celebrity frog. Scientists on ...

Frog fossils are rare ... The fossil record shows that frogs date back to the Permian, about 270 million years ago. However, until recently, no tadpole fossil older than the Cretaceous, over ...