Number of Presumed Extinct Species
Source: The Nature Conservancy and Association for Biodiversity Information
Map Description:
This map depicts the number of presumed or possibly extinct animal and plant species that have been lost from each state. The map and text are from the excellent publication intitled "Presious Heritage: The Status of Biodiversity in the United States", by The Nature Conservancy and Association for Biodiversity Information (fig. 4.10, pg. 117). Inset numbers refer to each state's presumed/possibly extinct (GX/GH) species. Figures are based on the 539 U.S. species recorded in the the Natural Heritage Central Databases as presumed or possibly extinct.

Cautions for this Product:
Documenting extinctions can be extremely difficult. In some ways, it is like searching a haystack for a needle that isn't there anymore. For this reason, The Nature Conservancy and Natural Heritage Program are very cautious in listing species as presumed extinct (GX) unless exhaustive searches of all suitable habitat have been carried out and there is no more cause for hope. Those species suspected of being extinct but warranting further searcheres are ranked in the more conservative category of possibly extinct (GH). Map used with permission from The Nature Conservancy and Oxford Press

For Further Information:
"Precious Heritage: The Status of Biodiversity in the United States", B. Stein, L. Kutner and D. Adams, editors. Oxford Press. 2000.