Cordillera Ground-warbler Robsonius rabori


Justification of Red List Category
This species is listed as Vulnerable as it is thought to have a small population size, which is declining as a result of habitat loss.

Population justification
The species has been described as uncommon. However, it may be more common than suggested by field observations, owing to its secretive habits (del Hoyo et al. 2007). It is conservatively suspected to number fewer than 10,000 mature individuals, based on known records, low population density estimates for species of similar body size and assuming only a proportion of its range is occupied.

Trend justification
This species is suspected to be declining at an unquantified rate owing to habitat destruction (del Hoyo et al. 2007, R. Hutchinson in litt. 2010).

Distribution and population

Robsonius rabori is found in northern Luzon, Philippines.


This species is found in lowland forest and secondary growth from sea-level to 1,300 m. It presumably feeds on invertebrates, and has been observed walking across the forest floor searching for prey in the leaf litter, sometimes in pairs (del Hoyo et al. 2007, J. C. Gonzalez in litt. 2010). It is often encountered in the vicinity of small streams (D. Allen in litt. 2012). Very little is known about its breeding habitats. Its nest is a large dome made of dry sticks, branches and leaves (Sánchez-González et al. 2010).


Logging within its elevational range has been described as extensive (del Hoyo et al. 2007).

Conservation actions

Conservation Actions Underway

Conservation Actions Proposed
Assess the population size and establish a monitoring programme to establish trends. Establish its ability to persist in degraded habitats. Identify and assess threats. Ensure that its remaining habitat receives effective protection.



Text account compilers
Allinson, T, Calvert, R., Symes, A., Taylor, J., Martin, R & Westrip, J.

Allen, D., Gonzalez, J., Hosner, P. & Hutchinson, R.

Recommended citation
BirdLife International (2022) Species factsheet: Robsonius rabori. Downloaded from on 01/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 01/12/2022.