Costa Rica is a remarkable place for amphibians and reptiles. Known for its biological diversity, conservation priorities, and extensive protected lands, this small country contains 418 herpetological species including the dangerous Fer-de-Lance and Black-headed Bushmaster, the beloved sea turtles, and numerous dink, foam, glass, and rain frogs. Additional species are thought to be nearing extinction while others have been introduced only recently. Amphibians and Reptiles of Costa Rica is the perfect introductory guide to this diverse herpetofauna in a format that makes it easy to carry into the field. The focus is on identification with entries for all species in the country, including scientific and English common names, as well as the older names for the many species that have been recently reclassified. Key ID marks are noted as well as adult sizes. Range maps identify the region(s) where species are known to be present. Color photographs and drawings are provided for over 80 percent of the species, representing those that are most likely to be encountered. Designed with ease of use in mind, this guide will be a great aid to the observer in identifying the specimen at hand.