Larus ridibundus -- Black-headed Gull; Common Black-headed Gull, Gaviota encapuchada, mouette rieuse. Alternate name on piece: Chroicocephalus ridibundus [Black-headed gull] Well finished painting of 4 nestlings; at foot of sheet: "Young black headed Gull"; not used directly for the plate cited. Artist's name(s): Wolf, Joseph; Richter, Henry Constantine.