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Which birds are placed with pelicans in an alternate classification of Pelecaniformes?

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Three eastern white pelicans with black-tipped wings take off from a muddy shoreline, wings outstretched, with blurred green vegetation in the background. — Pelecaniform European white pelicans (*Pelecanus onocrotalus*) in flight.

In an alternate classification of the order Pelecaniformes, pelicans are grouped with the following birds:

Herons and egrets (family Ardeidae)
Ibises and spoonbills (family Threskiornithidae)
The hammerhead (Scopus umbretta)
The shoebill (Balaeniceps rex)12

This revised classification reflects modern genetic analysis, which suggests that other birds traditionally placed in the order—such as cormorants, anhingas, frigate birds, gannets, and boobies—are more accurately categorized within their own order, Suliformes, while tropic birds are placed in the order Phaethontiformes.12