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Check the following websites first for information about your species before searching for other types of information. THe IUCN Red List site should be helpful for most species; try the other websites listed next depending on the species that you're researching.
Websites on Endangered and Threatened Species
The IUCN Red List of Threatened Species™ is widely recognized as the most comprehensive, objective global approach for evaluating the conservation status of plant and animal species. The plants, fungi and animals assessed for The IUCN Red List are the bearers of genetic diversity and the building blocks of ecosystems, and information on their conservation status and distribution provides the foundation for making informed decisions about conserving biodiversity from local to global levels.