Sulidae, the taxon, a type of bird and Chordate
order Suliformes, a proposed order by the International Ornithologist's Union
Pelecaniformes, an order of medium-sized and large waterbirds found worldwide
Neognaths, birds within the subclass Neornithes of the class Aves
Traditionally, an order Ciconiiformes has included a variety of large, long-legged wading birds with large bills: storks, herons, egrets, ibises, spoonbills, and several others
Modern birds, a most recent common ancestor of all living birds and all its descendants
bird (a feathered animal with wings)
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