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Over the last 10 years, herpetologists like Raoul Bain at the Museum's Center for Biodiversity and Conservation have been intensively studying frogs in Southeast Asia to discover cryptic species. A group of species is considered cryptic when the species are barely distinguishable from one another and have long been considered to be one species. Cryptic speciation is common in amphibians, in part because they've been studied less than larger animals. 
This interactive highlights Odorrana chloronota, a species of frog found in swift rivers and streams across Southeast Asia, or so it seemed until Bain, Bryan Stuart from Chicago's Field Museum, and other herpetologists from around the world looked carefully at its physical and genetic distinctions.