Bucerotiformes

Bucerotiformes is an order that contains the hornbills, hoopoe and wood hoopoes. Sometimes classified as members of Coraciiformes although increasing amount of evidence seem to support these birds being distinctive enough to warrant their own order. Recent genetic data show that ground hornbills and Bycanistes form a clade outside the rest of the hornbill lineage. They are thought to represent an early African lineage, while the rest of Bucerotiformes evolved in Asia. The hoopoe subspecies Saint Helena hoopoe and the Madagascar subspecies are sometimes elevated to a full species. For more information, visit the Wikipedia entry. Get back to Aves
Great hornbill	Hoopoe	Rufous hornbill	Southern ground hornbill