Ceratogymna is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of large, primarily frugivorous hornbills (family Bucerotidae) found in the humid forests of Central

Central Africa

Central Africa is a core region of the African continent which includes Burundi, the Central African Republic, Chad, the Democratic Republic of the Congo, and Rwanda....

 and West Africa

West Africa

West Africa or Western Africa is the westernmost region of the African continent. Geopolitically, the UN definition of Western Africa includes the following 16 countries and an area of approximately 5 million square km:-Flags of West Africa:...

. They are sexually dimorphic, with males being overall black, while females have brown heads and a smaller casque. Unlike the members of the genus Bycanistes

Bycanistes

Bycanistes is a genus of medium to large, primarily frugivorous hornbills found in the forests and woodlands of sub-Saharan Africa. They have often been included in the genus Ceratogymna, but today most authorities consider them separate. All species in this genus have a black and white plumage...

, the two species in the genus Ceratogymna have extensive, primarily blue, bare facial skin and dewlap

Dewlap

A dewlap is a longitudinal flap of skin that hangs beneath the lower jaw or neck of many vertebrates. While the term is usually used in this specific context, it can also be used to include other structures occurring in the same body area with a similar aspect, such as those caused by a double...

, and the only white in their plumage

Plumage

Plumage refers both to the layer of feathers that cover a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage vary between species and subspecies and can also vary between different age classes, sexes, and season. Within species there can also be a...

 is in the tail (although the Yellow-casqued Wattled Hornbill also has slight whitish speckling on the neck).

Species

• Black-casqued Wattled Hornbill (Ceratogymna atrata).
• Yellow-casqued Wattled Hornbill (Ceratogymna elata).

The members of the genus Bycanistes

Bycanistes

Bycanistes is a genus of medium to large, primarily frugivorous hornbills found in the forests and woodlands of sub-Saharan Africa. They have often been included in the genus Ceratogymna, but today most authorities consider them separate. All species in this genus have a black and white plumage...

have been included in this genus, but today most authorities consider the two separate.