CR

Cyornis ruckii

Unknown

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Rueck's Blue Flycatcher faces severe population decline primarily due to extensive deforestation and habitat degradation across its limited range in Southeast Asian lowland forests. The species' specialized requirements for primary forest understory make it particularly vulnerable to logging operations and agricultural conversion. Mining activities and infrastructure development have further fragmented the remaining suitable habitat, while the bird's restricted range amplifies the impact of these localized threats.

Threat summary

Habitat

Rueck's Blue Flycatcher inhabits the understory of primary and mature secondary lowland tropical forests, typically below 500 meters elevation. The species shows a strong preference for dense forest interior with minimal human disturbance, requiring intact canopy cover and rich insect populations.

Forest· major

Conservation measures underway

Site/area protectionSpecies managementSpecies recoveryLegislation

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Unknown

Frequently asked questions

Why is Cyornis ruckii classified as Critically Endangered?
Cyornis ruckii 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. Rueck's Blue Flycatcher faces severe population decline primarily due to extensive deforestation and habitat degradation across its limited range in Southeast Asian lowland forests. The species' specialized requirements for primary forest understory make it particularly vulnerable to logging operations and agricultural conversion. Mining activities and infrastructure development have further fragmented the remaining suitable habitat, while the bird's restricted range amplifies the impact of these localized threats.
Where does Cyornis ruckii live?
Cyornis ruckii occurs in Indonesia, and Malaysia. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Cyornis ruckii?
The main threats to Cyornis ruckii are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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