While working on her PhD in 1992, Karen Lips went to Las Tablas, Panama, to study the biology of a tree frog, Hyla calypso, an inch-long, spiny, bright-green creature. As she walked through transects in the forest, measuring and sexing frog individuals, here and there she noticed a handful of dead frogs on the forest floor. Collecting them, but not thinking much of it, she took the dead frogs to a veterinarian. The vet examined the frogs and noticed something strange on their skin, but could not explain their deaths.
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Frog killer
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