The next oldest tadpole had been dated to the early Cretaceous, 145 million to 100 million years ago. The newfound fossil is also the first ancient tadpole that has been matched to its adult ...

the first tadpole record of the year. "Warmer weather at the end of winter tricks species like the frog into thinking it's time to start reproducing. "That becomes a problem, though, if some early ...

However, scientists have found no tadpole fossils older than 145 million years, which makes it difficult to understand where they came from and how they evolved early on. The fossil record of ...

The tadpole stage can last for days or years, depending on the species and the weather. Arizona Game and Fish (AGF) considers the bullfrog an invasive aquatic animal species introduced to the western ...