WASHINGTON, February 13, 2013—The U.S. Department of Agriculture's Wildlife Services' (WS) National Wildlife Research Center (NWRC) today announced that the U.S. Environmental Protection Agency (EPA) has granted regulatory approval for the use of GonaConTM - Equine immunocontraceptive vaccine (GonaCon) in adult female wild or feral horses and burros. GonaCon was developed by NWRC scientists and is the first single-shot, multiyear wildlife contraceptive for use in mammals.