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The Center for Biological Diversity (Center), based in Tucson, Arizona, is a nonprofit membership organization with approximately 625,000 members and online activists, known for its work protecting endangered species through legal action, scientific petitions, creative media and grassroots activism. The Center has offices and staff in New Mexico, Arizona, Nevada, California, Oregon, Illinois, Minnesota, Alaska, Vermont, Florida and Washington, D.C. It was founded in 1989 by Kieran Suckling, Peter Galvin, Todd Schulke and Robin Silver.