Hornbills are in the family Bucerotidae consisting of two subfamilies and 13 genera. Most are in the subfamily Bucerotinae with 51 species.

The hornbills in Discovery Cove and California Zoos are highlighted in red.

Subfamily Bucerotinae all but ground hornbills
Trumpter Hornbill Bycanistes bucinator
Genus Tropicranus (sometimes included in Tockus)
White-crested Hornbill,
West African Long-tailed Tropicranus albocristatus
Genus Tockus
Black Dwarf Hornbill Tockus hartlaubi
Red-billed Dwarf Hornbill Tockus camurus
Monteiro's Hornbill Tockus monteiri
Red-billed Hornbill Tockus erythrorhynchus
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
African Grey Hornbill Tockus nasutus
Genus Ocyceros
Malabar Grey Hornbill Ocyceros griseus
Ceylon 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
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 Bycanistes (sometimes included in Ceratogymna).
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
Genus Ceratogymna
Black-casqued Hornbill Ceratogymna atrata
Yellow-casqued Hornbill Ceratogymna elata


Subfamily Bucorvinae Ground Hornbills
Southern Ground Hornbill Bucorvus leadbeaten
Northern Ground Hornbill,
Abyssinian Ground Hornbill Bucorvus abyssinicus