Parotia sefilata -- Western Parotia. Alternate name on piece: Parotia sexpennis [Six-plumed bird of paradise] Rough colored sketch with penciled title "The Challenge" and with a setting more illustrative of that title than used for the published plate; very unusually, the drawing is at ca. 30%. Since the pattern of use called for 100% from sketch to plate, could this have been intended for a different purpose, although using the same birds and poses as published? Artist's name(s): Gould, John; Hart, William Matthew.