Yellow-Casqued Hornbills are often predated upon by Crowned Eagles, which rely on surprising their prey to catch them. A defence mechanism Yellow-Casqued Hornbills have learnt is “mobbing”, this consists of a group of them approaching the predator and shrieking at them to ruin the element of surprise.
Yellow-Casqued Hornbills have learnt to distinguish the alarm calls made by the Diana Monkeys. They will hide in response to a Crowned Eagle warning, but ignore the warnings made in response to Leopards – as they don’t prey on Hornbills.
Pregnant Hornbills lay their eggs in the hollow trunk of trees. The Male Hornbill will then seal the mother and the eggs in the tree using mud and droppings. He will allow a small hole in the opening, just large enough to fit his bill through and pass food to the mother and the chicks. This prevents attack from predators such as Snakes.
The bill of the Hornbill is so heavy that in order to support it the vertebrae in its neck are fused and it has very strong neck muscles.
A Hornbill’s bill is so large that it intrudes their vision. This allows them to perform tasks using the tip of their bill with high precision.
Hornbill’s are the only bird with eyelashes
Over the period of a month a male Hornbill will offer a female Hornbill gifts of food to prove his worthiness as a mate
During the nesting season the male Hornbill must feed his chicks and the mother. He can regurgitate up to 60 fruits at one go.