Photographs of articulated bird skeleton of a Channel-billed cuckoo, Asian Koel and Australian Bustard

Scythrops novahollandiae, Eudynamys scolopacea and Ardeotis australis or Choriotis australia skeletons.

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A recent clade grouping based on genetic analysis of cuckoos and koels combined with bustards, called Otidimorphae. The relationship with other orders is unclear at present.

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Courtesy of the University Museum of Zoology, Cambridge