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One frog species turned out to be six or seven. Scientists say billions more may be hiding.

For nearly two centuries, a small brown frog living in Southeast Asian rainforests was considered a single, well-understood species. It had a name. It had a place in the textbooks. Case closed. Then ...

A fanged frog long thought to be one species is revealing itself to be several

When a new species is discovered, it's tempting to imagine an adventure novel, said Chan Kin Onn of Michigan State University ...