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.

Scientists have discovered the oldest-known fossil of a tadpole, which lived among the Jurassic dinosaurs 160 million years ...

The researchers believe that N. degiustoi likely reached its giant size—which rivaled that of most anurans alive during the age of reptiles (251.9–66.0 million years ago)—as a result of having a long ...