After more than five decades of intensive research on a wide variety of reptiles and amphibians at the Savannah River Site, the known occurrence of some members of the herpetofauna remains unresolved. One such "problem species," Pseudacris brimleyi (Brimley's Chorus Frog), was recently found for the first time in over 50 years. The rediscovery of this cryptic species shows how the concept of hidden biodiversity not only applies to the general public, but to the scientific community as well.