Black-and-white-casqued Hornbill (Bycanistes subcylindricus) [XC62988]
by Rory Nefdt from Kakamega Forest, Kenya (call)
Black-and-white-casqued Hornbill (Bycanistes subcylindricus) [XC498511]
by Andr\u00e1s Schmidt from Mbam et Djerem National Park, WCS research station for Chimpanzee studies, main camp, Cameroon (flight call)
Subspecies
Genus sometimes merged with Ceratogymna. Subspecies rather poorly differentiated.
The following 2 subspecies are recognised:
subcylindricus (Sclater, 1870) - Sierra Leone, north-eastern Liberia and Ivory Coast east to western Nigeria (delta of R Niger).
subquadratus Cabanis & Schutt, 1880 - Eastern Nigeria, Cameroon and Central African Republic east to southern Sudan, and south to northern and eastern Zaire, Uganda, south-western Kenya and north-western Tanzania. Also northern Angola.