Tockus

Trivial name Latin name
African grey hornbill Tockus nasutus
Southern Yellow-billed Hornbill Tockus leucomelas
Jackson's hornbill Tockus jacksoni
Eastern Yellow-billed Hornbill Tockus flavirostris
Red-billed Hornbill Tockus erythrorhynchus
Monteiro's Hornbill Tockus monteiri
Bradfield's Hornbill Tockus bradfieldi
Von der Decken's Hornbill Tockus deckeni

comparison of wing and tail configuration1

1 According to Hartmann (2000a, 2000b and 2016)