His success sparked the interest of C. Hart Merriam of the newly formed American Ornithologists' Union (AOU), who expanded the volunteer network to include the entire United States, Canada, and a portion of the West Indies.
His success sparked the interest of the newly formed American Ornithologists' Union (AOU), who convened a committee on the distribution and migration of birds and chose C. Hart Merriamto be its chief. The AOU expanded the volunteer network to include the entire United States, Canada, and a portion of the West Indies.