 This triggered 7-Eleven making an advanced of $250,000 representing 1-cent from the sale of more than 2-million "Endangered Species Cups" to the National Wildlife Federation (NWF) who purchased Bald Eagle habitat.The transfer of land to the U.S. Government and U.S.Fish and Wildlife Service took place on December 19, 1974 and came to be known as the Karl E. Mundt National Wildlife Refuge.