A monograph of the Bucerotidæ, or family of the hornbills.
Date 1882
Source http://www.biodiversitylibrary.org/pageimage/38534581
Author Daniel Giraud Elliot
Artist: John Gerrard Keulemans (1842-1912)
Source: https://commons.wikimedia.org/wiki/File:A_monograph_of_the_Bucerotid%C3%A6,_or_family_of_the_hornbills_(Plate_XVIII)_BHL38534581_(cropped).jpg

The Walden's hornbill (Aceros waldeni) locally called dulungan, also known as the Visayan wrinkled hornbill, rufous-headed hornbill or writhed-billed hornbill, is a critically endangered species of hornbill living in the rainforests on the islands of Negros and Panay in the Philippines.