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.

The fossil, which shed new light on the evolution of modern amphibians, previously sat unstudied and unidentified in the Smithsonian collection for about 40 years.

Scientists have discovered a new ancient amphibian species that could bridge the gap in understanding how modern-day frogs and salamanders developed. The fossilized skull of the 270-million-year ...

Scientists described the fossilized skull of Kermitops gratus, a creature that lived in what is now Texas about 270 million years ago, naming it after Kermit the Frog because of its resemblance to ...

The fossil, which shed new light on the evolution of modern amphibians, previously sat unstudied and unidentified in the Smithsonian collection for about 40 years.

Paleontologists have discovered a previously unknown ancient species: Kermitops — an amphibian that predates the dinosaurs and reveals the complexity of frog evolution.

The discovery of the world's oldest tadpole in Argentina could change our understanding of amphibian evolution, per a groundbreaking study published in the journal "Nature." ...

Researchers at the Smithsonian have discovered a new ancient species of amphibians that could help explain how modern-day frogs evolved.