The Knobbed Hornbills, Aceros cassidix – also known as Sulawesi Wrinkled Hornbill – is an Indonesian endemic that occurs in the tropical evergreen forests of Sulawesi, Buton, Lembeh, Togian and Muna Island.
This large black hornbill has a yellow bill, white tail feathers, pale blue skin around the eye, blackish feet, and a bare dark blue throat.
The male has a rufous buff face and neck, orange-red eyes, and a high reddish casque (a large display growth on the upper mandible of the bill).
The female has a black face and neck, yellow casque, and brownish eyes.
Diet / Feeding
They mostly feed on fruits and figs.
Breeding / Nesting
The Knobbed Hornbills is believed to be a monogamous species (loyal to one mate)..
The female seals herself inside a tree hole for egg-laying to keep out predators.
During this time, the male will provide foods for the female and the chicks through a small opening.