The helmeted hornbill (''Rhinoplax vigil'') is a very large

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

in the

hornbill Hornbills (Bucerotidae) are a family (biology), family of bird found in tropical and subtropical Africa, Asia and Melanesia. They are characterized by a long, down-curved bill which is frequently brightly coloured and sometimes has a Casque (an ...

family. It is found on the

Malay Peninsula The Malay Peninsula (Malay: ''Semenanjung Tanah Melayu'') is a peninsula in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area ...

Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...

Borneo Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and eas ...

, Thailand and Myanmar. The casque (helmetlike structure on the head) accounts for some 11% of its 3 kg weight. Unlike any other hornbill, the casque is almost solid, and is used in head-to-head combat among males. It is a belief among the

Punan Bah Punan Bah or Punan is an ethnic group found in Sarawak, Malaysia and in Kalimantan, Indonesia. The Punan Bah people are distinct and unrelated to the semi-nomadic Penan people. Their name stems from two rivers along the banks of which they hav ...

that a large helmeted hornbill guards the river between life and death.

Description

It has mostly blackish plumage, except that the belly and legs are white and the tail is white with a black band near the tip of each feather. The tail is long and the two central tail

feather Feathers are epidermal growths that form a distinctive outer covering, or plumage, on both avian (bird) and some non-avian dinosaurs and other archosaurs. They are the most complex integumentary structures found in vertebrates and a premier ...

s are much longer than the others, giving the bird a total length greater than that of any other hornbill species. The body length is , not counting the tail feathers, which boost the length a further . One male weighed in weight while two females averaged about . Although sometimes considered the largest Asian hornbill, their body weight appears to be similar to that of the

great hornbill The great hornbill (''Buceros bicornis''), also known as the concave-casqued hornbill, great Indian hornbill or great pied hornbill, is one of the larger members of the hornbill family. It occurs in the Indian subcontinent and Southeast Asia. It ...

(and considerably less than the African

ground hornbill The ground hornbills (Bucorvidae) are a family of the order Bucerotiformes, with a single genus ''Bucorvus'' and two extant species. The family is endemic to sub-Saharan Africa: the Abyssinian ground hornbill occurs in a belt from Senegal east ...

s). This species has a bare, wrinkled throat patch, pale blue to greenish in females and red in males. The

casque Casque is a French word for helmet. It can refer to: * Casque (anatomy), an enlargement on the beaks of some species of birds, including many hornbills *Hornbill ivory, the casque of the helmeted hornbill, collected as a decorative material * S. C ...

goes from the base of the

bill Bill(s) may refer to: Common meanings * Banknote, paper cash (especially in the United States) * Bill (law), a proposed law put before a legislature * Invoice, commercial document issued by a seller to a buyer * Bill, a bird or animal's beak Plac ...

halfway to the tip, where it ends abruptly. It and the bill are yellow; the red secretion of the

preen gland The uropygial gland, informally known as the preen gland or the oil gland, is a bilobed sebaceous gland possessed by the majority of birds used to distribute the gland's oil through the plumage by means of preening. It is located dorsally at the ...

covers the sides and top of the casque and the base of the bill, but often leaves the front end of the casque and the

distal Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position pro ...

half of the bill yellow. Unlike other hornbills, the helmeted hornbill's casque is solid, and the skull including the casque and bill may constitute 10 percent of the bird's weight.

Call

The call is a series of loud, intermittent barbet-like hoots, sometimes double-toned and over two dozen in number, which gradually accelerates to culminate in a cackle reminiscent of laughter.

Habits

Helmeted hornbills mostly eat the fruit of strangler figs. The birds breed once a year, producing a single chick. Mother and chick live inside a sealed tree cavity for the first five months of the chick's life. Males fight over territory on the wing, ramming each other with their casques. Such encounters are called aerial jousting. Females accompany males during an approach in an aerial joust but veer off in opposite directions during the collision.

Status

After ongoing hunting pressure and habitat loss, the helmeted hornbill was uplisted from

near threatened A near-threatened species is a species which has been categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature as that may be vulnerable to endangerment in the near future, but it does not currently qualify fo ...

to critically endangered on the

IUCN Red List of Threatened Species The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biologi ...

in 2015. It is listed in Appendix I of

CITES CITES (shorter name for the Convention on International Trade in Endangered Species of Wild Fauna and Flora, also known as the Washington Convention) is a multilateral treaty to protect endangered plants and animals from the threats of interna ...

. According to the conservation group

TRAFFIC Traffic comprises pedestrians, vehicles, ridden or herded animals, trains, and other conveyances that use public ways (roads) for travel and transportation. Traffic laws govern and regulate traffic, while rules of the road include traffic ...

, 2,170 casques were confiscated in just three years in China and Indonesia alone. There are fewer than 100 birds remaining in Thai forests. At least 546 hornbill parts, mostly casques of helmeted hornbills, have been posted for sale on Thai Facebook in the past five years. Traders will pay villagers 5,000-6,000

baht The baht (; th, บาท, ; currency sign, sign: ฿; ISO 4217, code: THB) is the official currency of Thailand. It is divided into 100 ''satang'' (, ). The issuance of currency is the responsibility of the Bank of Thailand. Society for Worldw ...

(US$165–200) for a hornbill head. Prices double or triple in cities and increase exponentially when sold overseas.

Ivory casque

The casque is the source of

hornbill ivory Hornbill ivory (also called "golden jade" or ''calao ivoire'' in French) is a precious ornamental material derived from the helmeted hornbill (''Buceros vigil''), a large bird of the Malay Peninsula, Sumatra, and Borneo. Many hornbill species hav ...

, a valuable carving material. Indigenous peoples also use the central tail feathers to decorate dancing cloaks and head-dresses. Historically, the casque was also used by carvers in China and Japan.

References

External links

BirdLife Species Factsheet

Video Helmeted Hornbill
National Geographic Society, National Geographic {{Authority control

helmeted hornbill The helmeted hornbill (''Rhinoplax vigil'') is a very large bird in the hornbill family. It is found on the Malay Peninsula, Sumatra, Borneo, Thailand and Myanmar. The casque (helmetlike structure on the head) accounts for some 11% of its 3 ...

Birds of Malesia Birds of Thailand Birds of Myanmar