Жантақты мүйізқұс – сипаттама және таралу аймағы

Species of bird
speciesbox
| name = Wreathed hornbill
| status = VU
| status system = IUCN3.1
| status ref =
| status2 = CITES A2
| status2 system = CITES
| status2 ref = It was placed in the genus Rhytidoceros by Daniel Giraud Elliot in 1882; in Rhyticeros by Allan Octavian Hume in 1878; and in Aceros by James L. Peters in 1931. The wreathed hornbill is a monotypic taxon and is widely recognized as a member of Rhyticeros, the genus of hornbills with low wreathed casques. Analysis of the mitochondrial genomes of eight hornbill species revealed that the wreathed hornbill is closely related with Aceros and the Visayan hornbill (Penelopides panini).

The wreathed hornbill is black with black legs and feet, but has a pale yellow bill, bare reddish skin around the eyes, a black band around the gular skin and a white tail. The female's gular skin is blue, whereas the male's is bright yellow; his neck is white and his nape dark reddish passing into black. Sexual dimorphism in the colouration of plumage and inflatable gular skin is less pronounced in young wreathed hornbills, but becomes more apparent as both sexes mature. It is a medium sized bird with a body length of ; adult males weigh from , and females weigh from The extra weight of the casque is supported by the fusion of the first two vertebrae. The bill has distinctive serrated casques near the base of the upper mandible, which are particularly unique because of its ridges. As the birds mature, forward growth causes the foremost ridge to break off.

The wreathed hornbill inhabits tropical evergreen forests in the region from southern Bhutan, Northeast India, Bangladesh and through mainland Southeast Asia to Indonesia, where it is restricted to Sumatra, Java, Borneo and a few smaller islands. It has been recorded up to an elevation of
In Northeast India, it inhabits unlogged primary forests and selectively logged forests in the foothills of the Eastern Himalayas from Nameri National Park in Assam to Namdapha National Park in Arunachal Pradesh. During the breeding season, it lives in lowland areas, but migrates to higher elevations in the non breeding season. In Myanmar, 62 wreathed hornbills were sighted in the Mali River valley at elevations of in winter 1999. A flock of about 50 individuals was sighted in Hponkanrazi Wildlife Sanctuary in September 2004.

The wreathed hornbill is a social bird and most active in the early mornings when foraging for fruits; 21 individuals studied in Pakke Tiger Reserve during the non breeding season rested at midday and resumed activity in the early afternoons. It lives in larger flocks than other hornbill species and remains in groups during both breeding and non breeding seasons. Flock size observed in Namdapha National Park ranged from a mean of 4.7 to 6.6 individuals with a density of in March and April to in December. It travels long distances to forage for fruit, sometimes flying between islands, but it does not migrate.