45 avian orders are distinguished here. Supraordinal clade-names follow Sangster et al. (2022). (view pdf) Intrafamiliar relationships of the megadiverse order Passeriformes are treated separately. (Passerine families)
Palaeognathae
Gallosanserae
Mirandornithes
Columbimorphae
Otidimorphae
Strisores
Opisthocomimorphae
Gruimorphae
Charadriimorphae
Phaethontimorphae
Aequornithes
Australaves
Accipitrimorphae
Strigimorphae
Coraciimorphae
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