The black-casqued hornbill (Ceratogymna atrata) or black-casqued wattled hornbill, is a species of hornbill in the family Bucerotidae. It is widely spread across the African tropical rainforest. Male and female black-casqued hornbill differ in physical appearance and are therefore an example of sexual dimorphism. The males are larger, have black feathers on their head, and have a larger casque. The females have brown hood of feathers. References External links Audio file of the sounds of the black casqued hornbill Freesound black-casqued hornbill Birds of the African tropical rainforest black-casqued hornbill Taxonomy articles created by Polbot