Through the generosity of Mary M. Trexler, the habitat group of the American Bison was erected in the Academy in 1934 in memory of her husband, General Harry C. Trexler. The specimens came from the famous herd on the Trexler game preserve near Allentown, Pennsylvania, the background being painted by C. Clarke Rosenkranz from sketches made in the Judith Basin Region, Montana. The group was designed by Harold T. Green and the formal opening held on Nov. 17, 1934.