Ancient amphibians bounced back from Earth's greatest mass extinction by exploiting freshwater prey, study suggests / Ancient amphibian ancestor discovered and named after Kermit the Frog / Scientists name newly discovered ancient amphibian species after Kermit the Frog / 270-million-year-old amphibian ancestor named after Kermit the Frog / Scientists name 270-million-year-old amphibian ancestor after Kermit the Frog / Researchers name prehistoric amphibian ancestor discovered in Smithsonian collection after Kermit the Frog