The J.N. "Ding" Darling National Wildlife Refuge is located on Sanibel Island on south Florida's Gulf Coast. The 8,000-acre refuge is part of the largest undeveloped mangrove ecosystem in the U.S. and is famous for its extraordinary migratory bird populations, including the roseate spoonbill, pictured here with a snowy egret. Several threatened and endangered species benefit from refuge habitats: Eastern indigo snakes, American alligators, American crocodiles, bald eagles, wood storks, peregrine falcons, Florida manatees and Atlantic loggerhead turtles. The park was named for Jay Norwood "Ding" Darling — a nationally syndicated editorial cartoonist and longtime conservationist who was appointed by FDR as director of the U.S. Biological Survey in 1934.