These include cormorant, black-headed gull and herring gull. Residents include Audouin's gull, blue rock thrush and Thekla lark. The lesser black-backed gull is smaller than the European herring gull. The classic ring species is the "Larus" gull. There are five subspecies of kelp gull. This spot triggers begging behavior in gull chicks. A confusable species is the great black-backed gull. The voice is distinctly deeper than most other gull species. The gull on the crest is a maritime reference. This is a list of gull species, presented in taxonomic sequence. He checks the cistern to see a dying gull floating inside. The smaller silver gull is largely confined to Australia. As the weeks progress, Winslow repeatedly encounters an aggressive one-eyed gull. In 2001 he starred in "From Hell" as the physician Sir William Withey Gull. The maximum recorded age for a wild great black-backed gull is 27.1 years.