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The Tink Frog (Eleutherodactylus diastema), once a commonly encountered species with dense populations, is one of 17 species of amphibians and lizards that have experienced steep declines, on the order of 75%, over the past 35 years at the La Selva Biological Station in lowland northeastern Costa Rica. (Photo by B. Kubicki, Costa Rican Amphibian Research Center, Guayacan, Costa Rica. Copyright 1995–2007 UC Regents. All rights reserved.)
