Island ecosystems are thought to be more vulnerable to invasive species - where they pose a greater threat of extinction to native animals and fauna. Getty Images The American bullfrog is known to ...

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

Conservation gets complicated when a native U.S. species is appreciated in one part of the country, but despised in another.

In an intriguing scientific discovery, Professor Louis du Preez and his team at the North-West University have announced the discovery of a newfound species of African bullfrog, named Pyxicephalus ...

Meanwhile, recent genetic analysis indicates that the highly imperiled Ramsey Canyon leopard frog (Rana subaquavocalis) is indistinguishable from the southern form of Rana chiricahuensis and will ...

That same year, American bullfrogs, an alien species unseen in the area before the March 2011 Great East Japan Earthquake and tsunami caused the nuclear disaster, were found in Soma. Although the ...

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 ...