From the Brink of Extinction, Some Frogs Defy the Odds

In 2003, two young biology students called Justin Yeager and Mark Pepper were in Costa Rica studying poison dart frogs when their guide presented them with a pair of beautiful orange-yellow and black frogs. They were left speechless, because in front of them was a species that was no longer meant to exist.

The Variable Harlequin Frog, Atelopus varius, had disappeared from cool streams across Costa Rica and Panama in the early 1990s, leaving not even a corpse to mark its existence. Its van

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