With over four million members or supporters, the National Wildlife Federation (NWF) is the country's largest and one of its most influential conservation organizations. The NWF has worked since 1936 to "promote wise use of the nation's wildlife and natural resources," and their primary goal is "to educate citizens about the need for sustainable use and proper management of our natural resources."

NWF sponsors National Wildlife Week, held during Earth Action Month, and it distributes over 620,000 education kits to more than 20 million students. NWF also operates the Institute for Wildlife Research, which concentrates on such creatures as bears, wild cats, and birds of prey. Their Backyard Wildlife Habitat Program distributes information and encourages homeowners to set up their own refuges for wild animals by providing food, water, and shelter, and by planting or preserving trees and shrubs and building backyard ponds. The program has certified...