In the 1920s, the organization also played a vital role in convincing the U.S. government to protect vital wildlife areas by including them in a National Wildlife Refuge system.
Na década de 1920 a organización tamén xogou un papel vital para convencer ao goberno de EUA de que protexese áreas naturais esenciais e as incluíse nun sistema de Refuxios de Vida Silveste Nacionais.