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From LiveScience.com:
Frogs species may be finely adapted to their environments, but new research shows immigrant species can quickly upset nature's delicate balancing act.
Over time, scientists counted water frog populations in Europe and noticed that the marsh frog (Rana ridibunda) can crowd out indigenous species like Graf's hybrid frog (Rana grafi) and the Iberian water frog (Rana perezi).
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