Researchers know frogs were hopping around as far back as 217 million years ago. But exactly how and when they evolved to begin as tadpoles remains unclear. This new discovery adds some clarity to ...

The frog is also threatened by introduced species: Bullfrogs and green frogs compete with Oregon spotted frogs for food, while fish introduced for sport fishing may also compete for prey — or prey on ...

The frog is also threatened by introduced species: Bullfrogs and green frogs compete with Oregon spotted frogs for food, while fish introduced for sport fishing may also compete for prey — or prey on ...