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

Justification of Red List category
Very little is known about the population size or status of this species. The population is suspected to be in decline as a result of loss and degradation of its forest habitat, however remote sensing data suggest that rates of forest loss in the species' range are not as high as previously thought and the area of suitable habitat remains very large. It is therefore listed as Least Concern. However, more research is needed to clarify the distribution, size and status of the population and to identify other possible threats. 

Population justification
Very little is known about this species: it was reported to be 'probably not common' by Cleere (2010) and 'local' by Eaton et al. (2021), however these descriptions lack quantitative support.

Trend justification
Forest loss, degradation and fragmentation are considered the main threats to this species. While forest clearance on Borneo has been extensive, rates of deforestation in montane areas are much lower than elsewhere. In the 14 years to 2022, forest cover in the species's range declined by c.4% (Global Forest Watch 2023, based on data from Hansen et al. [2013] and methods disclosed therein), and in the absence of evidence for other significant threats, this is suspected to be causing the population to decline at a similar rate.

Batrachostomus harterti is restricted to the Bornean Mountains Endemic Bird Area. Discounting its apparently erroneous listings for Tanjung Puting National Park and Poring (Sabah) (Mann 2008), it is known only from Sarawak, Malaysia (records from Mt Dulit, Usun Apau Plateau and Kelabit Uplands) and West Kalimantan, Indonesia (one record from Mt Liang Kubung) (Cleere and Nurney 1998, Cleere 2010, Eaton et al. 2021, MNS Bird Conservation Council 2021). Its distribution, particularly the extent to which it extends into North Kalimantan, is not well known and requires clarification. 

It inhabits primary and secondary submontane forest at c. 600-1,230 m (Cleere and Nurney 1998, Eaton et al. 2021). Reports from lower elevations, down to 300 m, are presumed to be errors (Holyoak and Kirwan 2020, Puan et al. 2020). 

Habitat loss, degradation and fragmentation as a result of logging and agricultural expansion is the only known threat to the species. While rates of deforestation in Borneo's lowlands have been high, many montane areas have experienced much lower rates of forest loss. Remote sensing data suggest a loss of c.4% tree cover in this species' range during 2008-2022 (Global Forest Watch 2023, based on data from Hansen et al. [2013] and methods disclosed therein). 

Conservation Actions Underway
The species's range overlaps with several protected areas, including Usun Apau National Park, Pulung Tau National Park and Betung Kerihun National Park (UNEP-WCMC and IUCN 2023).

Conservation Actions Proposed
Conduct surveys to gather data on the species's ecology, distribution, population size and status, and likely threats. Reassess its conservation needs following these surveys, recommending further areas for protection where appropriate.

Text account compilers
Berryman, A., Haskell, L.

Contributors
Benstead, P., Bird, J., Khwaja, N. & Taylor, J.

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Recommended citation
BirdLife International (2024) Species factsheet: Dulit Frogmouth Batrachostomus harterti. Downloaded from https://datazone.birdlife.org/species/factsheet/dulit-frogmouth-batrachostomus-harterti on 18/12/2024.
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 18/12/2024.