swallow-tailed gull creagrus furcatus preening at genovesa island, galapagos islands

america avian bay behaviour bird birds copy creagrus darwin ecuador endangered endemic eyes fauna furcatus galapagos genovesa grey grooming gull island laridae latin legs national nature nesting ocean ornithology outdoors pacific park plumage preening red rimmed rock sea seagull sitting south space swallow swallowtailed tailed tropical vertebrate white wild wildlife