Summary[edit] Description: English: Underside of bill of Corydon sumatranus - Dusky Broadbill, 1888Polski: Spodnia część dzioba Corydon sumatranus - szerokodzioba różowodziobego, 1888. Date: 31 December 2013, 13:43:51. Source: Catalogue of Birds in the British Museum, vol 14 https://www.biodiversitylibrary.org/page/8327828#page/489/mode/1up. Author: Philip Lutley Sclater, 1888.