Rhinoceros Hornbill

The distinctive horn-like structure on top of the Hornbill’s beak is called a casque, and it is made of keratin – the same material in our hair and fingernails. In most species, the casque is a light, hollow structure and scientists think it is used to amplify the bird’s calls in the dense forests, so they can be heard for miles. It also serves as a visual feature, allowing birds to see each other and attract potential mates’ attention.