Phylum Chordata Bateson, 1885 - chordates
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   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
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     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
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       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
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         Order Charadriiformes Huxley, 1867 - shorebirds, gulls, auks
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           Suborder Lari Sharpe, 1891 - gulls and allies
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             Family Laridae Vigors, 1825 - gulls, terns and skimmers
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               Subfamily Larinae Vigors, 1825 - gulls
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                 Genus Larus Linnaeus, 1758
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                   Larus modestus Tschudi, 1843 - grey gull
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