. "Larus" . . "Charadriiformes" . "Aves" . . . "Laridae" . . "Larus crassirostris" . "Chordata" . . "Larus crassirostris Vieillot 1818" . "Vieillot 1818" . "Black-tailed Gull" . . . "Animalia" . . . . . . . . . .