Bucerotiformes is an order that contains the hornbills, hoopoe, and wood hoopoes. These birds are sometimes classified as members of Coraciiformes, although increasing amounts of evidence seem to support them as being distinctive enough to warrant their own order.
Temporal range: Eocene to present
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. The two wood hoopoe genera, Phoeniculus and Rhinopomastus, appear to have diverged about 10 million years ago, so some systematists treat them as separate subfamilies or even separate families.
- †Laurillardia smoleni
- Suborder Upupi
- Family Phoeniculidae
- Genus Phoeniculus
- Genus Rhinopomastus
- Family Upupidae
- Family Phoeniculidae
- Suborder Buceroti
- Family Bucorvidae
- Family Bucerotidae
- Genus Bycanistes
- Genus Tropicranus (sometimes included in Tockus)
- White-crested hornbill, Tropicranus albocristatus
- Genus Tockus
- Black dwarf hornbill, Tockus hartlaubi
- Red-billed dwarf hornbill, Tockus camurus
- Monteiro's hornbill, Tockus monteiri
- Red-billed hornbill group
- Eastern yellow-billed hornbill, Tockus flavirostris
- Southern yellow-billed hornbill, Tockus leucomelas
- Jackson's hornbill, Tockus jacksoni
- Von der Decken's hornbill, Tockus deckeni
- Crowned hornbill, Tockus alboterminatus
- Bradfield's hornbill, Tockus bradfieldi
- African pied hornbill, Tockus fasciatus
- Hemprich's hornbill, Tockus hemprichii
- Pale-billed hornbill, Tockus pallidirostris
- African grey hornbill, Tockus nasutus
- Genus Ocyceros
- Genus Anthracoceros
- Genus Buceros
- Genus Rhinoplax (sometimes included in Buceros)
- Helmeted hornbill, Rhinoplax vigil
- Genus Anorrhinus
- Genus Penelopides
- Genus Berenicornis (sometimes included in Aceros)
- White-crowned hornbill, Berenicornis comatus
- Genus Aceros
- Genus Rhyticeros (sometimes included in Aceros)
- Genus Ceratogymna
- Gill, Frank; Donsker, David, eds. (2019). "Mousebirds, Cuckoo Roller, trogons, hoopoes, hornbills". World Bird List Version 9.2. International Ornithologists' Union. Retrieved 23 July 2019.
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- Yuri, T. et al. (2013) Parsimony and Model-Based Analyses of Indels in Avian Nuclear Genes Reveal Congruent and Incongruent Phylogenetic Signals. Biology, 2(1):419-444. doi:10.3390/biology2010419
- Jarvis, E.D. et al. (2014) Whole-genome analyses resolve early branches in the tree of life of modern birds. Science, 346(6215):1320-1331.
- Woodruff, D. S. & Srikwan, S. 2011. Molecular genetics and the conservation of hornbills in fragmented landscapes. In Poonswad, P. (ed) The Asian Hornbills: Ecology and Conservation. National Center for Genetic Engineering and Biotechnology, Bangkok, pp. 257-264.
- Fry, C. Hilary (2003). "Wood-hoopoes". In Perrins, Christopher. The Firefly Encyclopedia of Birds. Firefly Books. p. 383. ISBN 1-55297-777-3.