Even before Grinnell's Audubon Society was organized, the American Ornithologists' Union, founded in 1883, was aware of the dangers facing many birds in the United States.
Antes de que se organizase a Audubon Society de Grinnell, xa existía a American Ornithologists' Union (AOU), fundada en 1883, que se preocupaba dos perigos aos que tiñan que enfrontarse moitas aves en Estados Unidos.