Black-and-white-casqued Hornbill (Bycanistes subcylindricus) [XC467985]
by Andres Angulo from Mbam et Djerem National Park, Sanaga river, near to the WCS research station for Chimpanzee studies, Cameroon (flight call, song)
Black-and-white-casqued Hornbill (Bycanistes subcylindricus) [XC700894]
by Andr\u00e1s Schmidt from Bunyaruguru (near Katunguru), Bushenyi, Western Region, Uganda (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.