Parent: Bucerotidae (Hornbills)

└─ Tockus

└─── Tockus alboterminatus (Crested hornbill)

└─── Tockus bradfieldi (Bradfield's hornbill)

└─── Tockus camurus (Red-billed dwarf hornbill)

└─── Tockus deckeni (Von der decken's hornbill)

└─── Tockus erythrorhynchus (Red-billed hornbill)

└─── Tockus fasciatus (African pied hornbill)

└─── Tockus flavirostris (Eastern yellow-bellied hornbill)

└─── Tockus hartlaubi (Black dwarf hornbill)

└─── Tockus hemprichii (Hemprich's hornbill)

└─── Tockus jacksoni (Jackson's hornbill)

└─── Tockus leucomelas (Southern yellow-billed hornbill)

└─── Tockus monteiri (Monteiro's hornbill)

└─── Tockus nasutus (African grey hornbill)

└─── Tockus pallidirostris (Pale-billed hornbill)