This Web site provides a search facility for quickly locating and downloading 1-kilometer (30 arc-second) resolution grids of the distribution of species.

Data are available for global amphibian distributions, and for birds and mammals in the Americas. The site will provide you with access to individual species distribution grids, along with family grids that show the density and distribution of species within a given family. The grids are available in GeoTIFF format and are distributed in two forms: "original grids" that include grid values designating the status of occurrence (e.g., 1 = extant, 2 = possibly present, 3 = probably extinct, etc.), and "presence grids" that represent the "extent" category of the original grids as a grid value of "1," and all other areas as "0" (see About the Data ).

Shapefiles are available for download courtesy of Natureserve and the Global Amphibian Assessment. The grids are intended to be of assistance to researchers for modeling, conservation, and human dimensions research purposes.