The discovery in Patagonia shows that frogs have had a tadpole stage for at least 160 million years. Here’s how the ancient frogs compare to those of today. Tadpoles and adults of the extinct ...

Emerging from a partially frozen pond more than 6,000 feet high in the Alps, European common frogs (Rana temporaria) set out to find mates and begin breeding activities. These frogs have adapted ...