USGS
The North American Amphibian Monitoring Program (NAAMP) is a collaborative effort among regional partners, such as state natural resource agencies and nonprofit organizations, and the U.S. Geological Survey (USGS) to monitor populations of vocal amphibians. Amphibian population data are collected using a calling survey technique. Doing this allows observers identify local amphibian species by their unique vocalizations. Observers are trained to identify their local species by these unique vocalizations or "frog calls." The USGS provides its database management to monitor the population of vocal amphibians the regional partners recruits and train volunteer observers to collect amphibian population data. Website: http://www.pwrc.usgs.gov/naamp [Summary provided by the USGS.]
DOI/USGS/BRD/PWRC/NAAMP