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Craugastor escoces (Anura: Craugastoridae) reappears after 30 years: rediscovery of an “extinct” Neotropical frog

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We report the rediscovery of a declared extinct frog, Craugastor escoces, at the edge of a protected forest in the Juan Castro Blanco National Park, Alajuela, Costa Rica. This species, which is endemic to Costa Rica, had not been observed since 1986. The rediscovery of this species comes after 30 years without being seen and 12 years of being declared extinct. The site where we found the species is located in the west of the central mountain region of Costa Rica, which is >15 km away from its known distribution. Our finding adds another species to the list of the few rediscovered frogs declared extinct. Knowing that C. escoces can still be found triggers the need for conservation strategies to help the species survive.

Affiliations: 1: 1Institute of Evolutionary Ecology and Conservation Genomics, University of Ulm, Albert-Einstein Allee 11, D-89069 Ulm, Germany ; 2: 2Laboratory of Comparative Wildlife Pathology, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Orlando Marques de Paiva 87, São Paulo, Brasil ; 3: 3School of Biology, University of Costa Rica, Campus Rodrigo Facio, San Pedro de Montes de Oca, Costa Rica

*Corresponding author; e-mail:

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