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Wreathed Hornbill - BirdForum Opus

Alternative names: Bar-pouched Wreathed Hornbill; Bar-throated Wreathed Hornbill; Northern Waved Hornbill

Photo © by TanT
Male photographed in Khao Yai National park, Thailand
Rhyticeros undulatus

Aceros undulatus


Length 100 cm.
All-black wings contrasting with wholly white tail together with black bar on gular pouch diagnostic. Casque small with ridges. Bill whitish with corrugation on basal sides of maxilla and mandible. Orbital skin red.
Male: Crown and drooping crest brownish; gular pouch yellow; neck white.
Female: Head black, gular pouch pale blue.
In flight the underwings and belly are all-black; together with the white tail, this is distinctive.

Similar species

Photo © by pN'd
Khoa Yai, Thailand, September 2006

Larger than Plain-pouched Hornbill. Note also ridges on mandibles and dark bar on throat sac of males.


North-east India and Myanmar through South-East Asia to the Greater Sundas and Bali.
Still common in some parts of its range but forest loss has resulted in a patchy distribution.


This is a monotypic species.
The described subspecies ticehursti (northern mainland range) and aequabilis (Borneo) are normally not accepted.
Sometimes considered conspecific with Plain-pouched Hornbill.
This species has been placed in the genus Aceros.


Photo © by Chaiyan
Klongsaeng wildlife sanctuary, Surathanee province, southern Thailand, April 2005

Primary evergreen forest.
Mainly along foothills but occurs also up to 2560m.



Frequents the canopy. Usually flies in compact flocks of five to eight. Often gathers at fruiting trees together with other species. In flight the wing-beats are continuous, producing a distinct loud and sharp swishing sound. Glides less than other hornbills.


Breeds in a natural hole in a large tree, the female seals the entrance with droppings. Lays 2 eggs but only one chick usually raised.


  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2016. The eBird/Clements checklist of birds of the world: v2016, with updates to August 2016. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Del Hoyo, J, A Elliot, and J Sargatal, eds. 2001. Handbook of the Birds of the World. Volume 6: Mousebirds to Hornbills. Barcelona: Lynx Edicions. ISBN 978-8487334306

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