Ceratogymna (alternative name Bycanistes) is a genus of the hornbill family, Bucerotidae. Among the species included in the genus are:

Silverycheeked Hornbill – Ceratogymna brevis – Large sized bird, with length between 75 to 80 cm, characterized by a very large creamy casque on the beak, smaller in females. The head is silver-grey and the rest of the plumage is black, except for a broad white stripe in the back. The Silverycheeked hornbills are uncommon localized residents of the tall evergreen forests of eastern Africa, from South Africa. In Mozambique, Botswana, Congo, Kenya, the Caprivi strip of South Africa, where it feeds on fruits and large insects. Like other hornbills, the females incubate 4 to 5 white eggs, while sealed in the nest compartment.

Other species included in the genus are:

• Piping Hornbill, Ceratogymna fistulator
• Black-and-white-casqued Hornbill, Ceratogymna subcylindricus
• Brown-cheeked Hornbill, Ceratogymna cylindricus
• White-thighed Hornbill, Ceratogymna albotibialis
• Black-casqued Hornbill, Ceratogymna atrata
• Yellow-casqued Hornbill, Ceratogymna elata

Reference

• Gordon Lindsay Maclean - Robert's Birds of South Africa, 6th Edition