• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Justification of Red List category
Although this species remains common in many parts of its large range, it is considered Near Threatened as it is sensitive to habitat loss and degradation, which are likely to be causing moderately rapid population declines throughout its range.

Population justification
The population size of this species has not been quantified; it is considered fairly common to locally common (Eaton et al. 2021, eBird 2022).

Trend justification
Studies have revealed marked declines in density of this species following forest logging activities (del Hoyo et al. 2003). Remote sensing data indicate that in the three generations (12.6 years; Bird et al. 2020) to 2021, forest cover in this species' range was reduced by c.25% (Global Forest Watch 2022, based on data from Hansen et al. 2013 and methods disclosed therein). Although this species is tolerant of some degraded habitat, including overgrown plantations, this figure is thought to be broadly representative of the reduction in population size over the last three generations (set here to 20-29%). The same rate of reduction is suspected to occur in the future, with little sign of Sundaic lowland forest loss abating.

Calyptomena viridis occurs in the Sundaic lowlands, from south Tenasserim, Myanmar, peninsular and west Thailand, Sabah, Sarawak and Peninsular Malaysia, Singapore, Kalimantan (including the Natuna Islands) and Sumatra (including offshore islands), Indonesia and Brunei (BirdLife International 2001, eBird 2022).

This species occurs primarily in the understorey of primary evergreen and mixed dipterocarp forest in the lowlands, principally below 800 m, but occasionally to 1,700 m. It is also found in tall secondary forest and other secondary habitats if primary forest is adjacent. These habitats may only be used for foraging. Studies have revealed marked declines in density following logging activities (del Hoyo et al. 2003).

Rates of forest loss in the Sundaic lowlands have been extremely rapid (Global Forest Watch 2022) and this is the main threat to this forest-dependent species. Forest fires have locally also had a damaging effect. This species has been recorded in the Indonesian songbird trade (Chng et al. 2018), although it appears to be rare and is unlikely to be driving population declines.

Conservation Actions Underway
No targeted conservation actions are known for this species, although it occurs in a number of protected areas.

Conservation Actions Proposed
Conduct repeated surveys across the species' range to determine the magnitude of declines and rates of range contraction. Conduct ecological studies to improve understanding of its precise habitat requirements, tolerance of secondary habitats and response to fragmentation. Campaign for the protection of remaining tracts of lowland forest throughout the species' range.

Text account compilers
Berryman, A.

Contributors
Benstead, P., Taylor, J. & Gilroy, J.

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Recommended citation
BirdLife International (2024) Species factsheet: Green Broadbill Calyptomena viridis. Downloaded from https://datazone.birdlife.org/species/factsheet/green-broadbill-calyptomena-viridis on 22/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/11/2024.