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. 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.
Order Bucerotiformes
Suborder Upupi
Family Phoeniculidae
Genus Phoeniculus
Green wood hoopoe, Phoeniculus purpureus
Violet wood hoopoe, Phoeniculus damarensis
Black-billed wood hoopoe, Phoeniculus somaliensis
White-headed wood hoopoe, Phoeniculus bollei
Forest wood hoopoe, Phoeniculus castaneiceps
Genus Rhinopomastus
Black scimitarbill, Rhinopomastus aterrimus
Common scimitarbill, Rhinopomastus cyanomelas
Abyssinian scimitarbill, Rhinopomastus minor
Family Upupidae
Genus Upupa
Hoopoe, Upupa epops
Suborder Buceroti
Family Bucorvidae
Genus Bucorvus
Abyssinian ground hornbill, Bucorvus abyssinicus
Southern ground hornbill, Bucorvus leadbeateri
Genus Bycanistes
Trumpeter hornbill, Bycanistes bucinator
Piping hornbill, Bycanistes fistulator
Silvery-cheeked hornbill, Bycanistes brevis
Black-and-white-casqued hornbill, Bycanistes subcylindricus
Brown-cheeked hornbill, Bycanistes cylindricus
White-thighed hornbill, Bycanistes albotibialis
Family Bucerotidae
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
Northern red-billed hornbill, Tockus erythrorhynchus
Damara red-billed hornbill, Tockus damarensis
Southern red-billed hornbill, Tockus rufirostris
Tanzanian red-billed hornbill, Tockus ruahae
Western red-billed hornbill, Tockus kempi
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
Malabar grey hornbill, Ocyceros griseus
Sri Lanka grey hornbill, Ocyceros gingalensis
Indian grey hornbill, Ocyceros biostris
Genus Anthracoceros
Malabar pied hornbill, Anthracoceros coronatus
Oriental pied hornbill, Anthracoceros albirostris
Black hornbill, Anthracoceros malayanus
Palawan hornbill, Antracoceros marchei
Sulu hornbill, Anthracoceros montani
Genus Buceros
Rhinoceros hornbill, Buceros rhinoceros
Great hornbill, Buceros bicornis
Rufous hornbill, Buceros hydrocorax
Genus Rhinoplax (sometimes included in Buceros)
Helmeted hornbill, Rhinoplax vigil
Genus Anorrhinus
Austen's brown hornbill, Anorrhinus austeni
Tickell's brown hornbill, Anorrhinus tickelli
Bushy-crested hornbill, Anorrhinus galeritus
Genus Penelopides
Luzon hornbill, Penelopides manillae
Mindoro hornbill, Penelopides mindorensis
Visayan hornbill, Penelopides panini
Samar hornbill, Penelopides samarensis
Mindanao hornbill, Penelopides affinis
Sulawesi hornbill, Penelopides exarhatus
Genus Berenicornis (sometimes included in Aceros)
White-crowned hornbill, Berenicornis comatus (alt Aceros comatus (IUCN))
Genus Aceros
Rufous-necked hornbill, Aceros nipalensis
Wrinkled hornbill, Aceros corrugatus
Writhed hornbill, Aceros leucocephalus
Rufous-headed hornbill, Aceros waldeni
Knobbed hornbill, Aceros cassidix
Genus Rhyticeros (sometimes included in Aceros)
Wreathed hornbill, Rhyticeros undulatus
Narcondam hornbill, Rhyticeros narcondami
Sumba hornbill, Rhyticeros everetti
Plain-pouched hornbill, Rhyticeros subruficollis
Papuan hornbill, Rhyticeros plicatus
Genus Ceratogymna
Black-casqued wattled hornbill, Ceratogymna atrata
Yellow-casqued wattled hornbill, Ceratogymna elate
