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Organism
  Animalia
      Chordata
            Aves
              Avialae
                    Charadriiformes
                      Charadriimorphae
                            Laridae
                                     Chroicocephalus
                                             Chroicocephalus cirrocephalus
                                                   [Larus cirrocephalus]
                                             Chroicocephalus philadelphia
                                                   [Larus philadelphia]
                                             Chroicocephalus ridibundus
                                     Gelochelidon
                                             Gelochelidon nilotica
                                                   [Geochelidon nilotica]
                                                   [Sterna nilotica]
                                     Geochelidon
                                     Hydroprogne
                                             Hydroprogne caspia
                                                   [Sterna caspia]
                              Larinae
                                     Hydrocoloeus
                                             Hydrocoloeus minutus
                                Larini
                                     Creagrus
                                             Creagrus furcatus
                                     Larus
                                             Larus argentatus
                                             Larus belcheri
                                             Larus californicus
                                             Larus canus
                                             Larus crassirostris
                                             Larus delawarensis
                                             Larus dominicanus
                                             Larus fuscus
                                             Larus glaucescens
                                             Larus glaucoides
                                             Larus heermanni
                                             Larus hyperboreus
                                             Larus livens
                                             Larus marinus
                                             Larus michahellis
                                             Larus occidentalis
                                             Larus schistisagus
                                             Larus thayeri
                                     Leucophaeus
                                             Leucophaeus atricilla
                                                   [Larus atricilla]
                                             Leucophaeus modestus
                                                   [Larus modestus]
                                             Leucophaeus pipixcan
                                                   [Larus pipixcan]
                                     Pagophila
                                             Pagophila eburnea
                                     Rhodostethia
                                             Rhodostethia rosea
                                     Rissa
                                             Rissa brevirostris
                                             Rissa tridactyla
                                     Onychoprion
                                             Onychoprion aleuticus
                                             Onychoprion anaethetus
                                                   [Sterna anaethetus]
                                             Onychoprion fuscatus
                                                   [Sterna fuscata]
                                             Onychoprion lunatus
                              Rynchopinae
                                     Rynchops
                                             Rynchops niger
                                                   [Rynchops nigra]
                              Sterninae
                                     Anous
                                             Anous minutus
                                             Anous stolidus
                                     Chlidonias
                                             Chlidonias hybrida
                                             Chlidonias leucopterus
                                             Chlidonias niger
                                     Gygis
                                             Gygis alba
                                               Gygis alba candida
                                     Procelsterna
                                             Procelsterna cerulea
                                     Sterna
                                             Sterna dougallii
                                             Sterna forsteri
                                             Sterna hirundo
                                             Sterna paradisaea
                                Sternini
                                     Larosterna
                                             Larosterna inca
                                     Phaetusa
                                             Phaetusa simplex
                                     Thalasseus
                                             Thalasseus acuflavidus
                                               Thalasseus acuflavidus acuflavidus
                                                     [Thalasseus sandvicensis acuflavidus]
                                             Thalasseus bergii
                                             Thalasseus elegans
                                                   [Sterna elegans]
                                             Thalasseus maximus
                                                   [Sterna maxima]
                                             Thalasseus sandvicensis
                                                   [Sterna sandvicensis]
                                     Sternula
                                             Sternula albifrons
                                             Sternula antillarum
                                                   [Sterna antillarum]
                                             Sternula superciliaris
                                                   [Sterna superciliaris]
                                     Xema
                                             Xema sabini