CR

Rhinoplax vigil

Declining

Overview

The helmeted hornbill is a very large bird in the hornbill family. It is found on the Malay Peninsula, Sumatra, Borneo, Thailand and Myanmar. The casque 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 that a large helmeted hornbill guards the river between life and death.

The Helmeted Hornbill faces severe population decline primarily due to intensive hunting for its solid casque, which is carved into valuable ornaments and traded illegally across Southeast Asia. Deforestation and habitat fragmentation have eliminated vast areas of the lowland and hill forests this species requires, while logging operations disrupt their specialized nesting sites in large tree cavities. The combination of high market demand for hornbill ivory and rapid forest conversion has pushed this once-widespread species to the brink of extinction across its range.

Threat summary

Habitat

Rhinoplax vigil inhabits primary and secondary lowland and hill forests up to 1,500 meters elevation across Southeast Asia. The species requires large, mature trees with suitable cavities for nesting and depends on fig trees and other fruiting species that provide its primary food sources.

Forest· majorWetlands (inland) - Permanent rivers/streams· major

Conservation measures underway

Species managementSpecies recoveryAwareness & communicationsLegislationPolicies and regulationsCompliance and enforcement

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Frequently asked questions

Why is Rhinoplax vigil classified as Critically Endangered?
Rhinoplax vigil is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. The Helmeted Hornbill faces severe population decline primarily due to intensive hunting for its solid casque, which is carved into valuable ornaments and traded illegally across Southeast Asia. Deforestation and habitat fragmentation have eliminated vast areas of the lowland and hill forests this species requires, while logging operations disrupt their specialized nesting sites in large tree cavities. The combination of high market demand for hornbill ivory and rapid forest conversion has pushed this once-widespread species to the brink of extinction across its range.
Where does Rhinoplax vigil live?
Rhinoplax vigil occurs in Brunei, Indonesia, Malaysia, Myanmar (Burma), Singapore, and Thailand. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Rhinoplax vigil?
The main threats to Rhinoplax vigil are 1.1, 2.1, 4.1, and 5.1. The full IUCN-classified threat record for this species is detailed on the species page.

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