ARDEAE \-+--EURYPYGIMORPHAE | | | |--Eurypygiformes | | |--Rhynochetidae (Kagu) | | \--Eurypygidae (Sunbittern) | | | \--Phaethontiformes | \--Phaethontidae (Tropicbirds) | | \-AEQUORNITHES \-+--Gaviiformes | \--Gaviidae (Loons) \--+--+--Sphenisciformes | | \--Spheniscidae (Penguins) | \--Procellariiformes | \--+--Diomedeidae (Albatrosses) | \--+--Oceanitidae (Southern Storm Petrels) | \--+--Hydrobatidae (Northern Storm Petrels) | \--Procellariidae (Petrels, Shearwaters) | |--Ciconiiformes | \--Ciconiidae (Storks) \-+--Suliformes | \--+--Fregatidae (Frigatebirds) | \--+--Sulidae (Gannets, Boobies) | \--+--Anhingidae (Anhingas) | \--Phalacrocoracidae (Cormorants) \-+--Plataleiformes | \--Threskiornithidae (Ibises, Spoonbills) \--+--Pelecaniformes | \--+--+--Scopidae (Hamerkop) | | \--Balaenicipitidae (Shoebill) | \--Pelecanidae (Pelicans) \--Ardeiformes \--Ardeidae (Herons, Egrets, Bitterns)