Endangered
Walden's Hornbill
Rhabdotorrhinus waldeni
Walden's Hornbill is a bird in the family Bucerotidae (order Bucerotiformes) — Rhabdotorrhinus waldeni, recorded as Endangered.
Appearance
Mostly black with a cream-colored tail with black terminal band, an orange casque, and a wrinkled lower bill. Male has a rufous head, a yellow pouch, and yellow around the eye. Female has a black neck and head, a smaller bill and casque, and blue and yellow around the eye and on the chin.
Range and habitat
It inhabits closed-canopy forests, also frequenting logged areas and occasionally isolated trees in clearings at an altitudinal range of 400 to 1,200 m Panay and 350 to 950 m in Negros. Walden's hornbill locally called dulungan, also known as the Visayan wrinkled hornbill, rufous-headed hornbill or writhe-billed hornbill, is an endangered species of hornbill living in the rainforests on the islands of Negros and Panay in the Philippines. It is closely related to the writhed hornbill, but can be recognized by the yellow throat and ocular skin in the male, and the blue throat and ocular skin in the female (both throat and ocular skin are deep orange or red in both sexes of the writhed hornbill).
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Diet and breeding
All hornbills are monogamous and mate for life.They are cavity nesters and rely on large dipterocarp trees for breeding. The female seals itself within the tree cavity and the male is in charge of gathering food for its mate and chicks.
The male stores food in a gular pouch and regurgitates it to feed its mate and chicks. Cooperative breeding wherein immature birds from previous seasons help out in feeding the female and chick have not been observed with this species so far.
In crisis
In 2025, this species was downlisted to endangered from critically endangered. The IUCN Red List estimates the population to be 1,000 to 3,000 mature individuals with the population continuing to decline. This species is particularly at risk as a large majority of the population is found in the Central Panay Mountain Range that is an unprotected area.
It is presumed extinct on Guimaras and now survives only on Negros and Panay, No recent figures are available for Negros, where it may be functionally extinct. The species population estimate is based on a 2007 study by the Philinthat supposedly found nest 1,018 nests by Philippine Initiative for Conservation of Environment through their nest protection program.
Walden's Hornbill is Endangered on this catalog because that is the IUCN category stored on Wikidata. Confirm the official criteria and any later count on iucnredlist.org.
Sources
Written for this catalog from the English Wikipedia article on Walden's Hornbill, Wikidata item Q27074827. Family and order context is original field-guide writing about the group, not a copied assessment of this one species. Wikipedia text is CC BY-SA. Not an IUCN assessment. Counts, when quoted, can change — confirm them on the recovery programme and on iucnredlist.org.
