 Hornaday played a commanding role in selection of the site for the Bronx Zoo—a nickname he hated—which opened in 1899, and in the design of early exhibits.He served in the triple role of Director, General Curator, and Curator of Mammals.Among his several activities, he established one of the world's most extensive collections, insisted on unprecedented standards for exhibit labeling, promoted lecture series, and offered studio space to wildlife artists.