Poison dart frogs have fascinated researchers. Now their toxin has allegedly been linked to the death of Russian opposition leader Alexei Navalny.
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First, the frogs died. Then people got sick.
ALTOS DE CAMPANA NATIONAL PARK, Panama — Brian Gratwicke’s lunch box was full of frogs. Kneeling on the muddy rainforest floor, the biologist opened his red Coleman cooler and scooped one up. It was a ...
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