Falco cenchroides -- Australian Falcon, Nankeen Kestrel. Alternate name on piece: Tinnunculus cencroides [Nankeen kestrel] Much erasure; erased head of bird similar to faint outline of different pose on other side of sheet (Gould item 1289b); evidence of tracing; carefully drawn human foot at top of sheet. Artist's name(s): Gould, John; Richter, Henry Constantine. Gould's conceptual drawing worked up by Richter, notably in heads, feet and one tail, as well as establishing clear outlines.