Author 'Nicoledesplat' (Id 155831 ) : - The Javan rhinoceros hornbill - (Bureros rhinoceros silvestris) A Bird Helmet very large: 11: hornbills helmet is made of a lightweight honeycomb structure surrounded by a layer of keratin. The function of the helmet of hornbills is controversial. Some think it serves to amplify the song in the style of a sounding board. Others ascribe a value to search for food (fruit and small prey hidden in dense vegetation) and homeland defense. The beak of the hornbill and the headphones are naturally white rhinos. However, over the years, they have a yellow-orange: the rhinoceros hornbill beak coated with secretions from a gland under the tail that give this color ... : 18:: 1: