Habitat
Broadleaf evergreen forest, forest edge, secondary growth, and can be found in the vicinity of limestone rocks and outcrops and amongst moss-covered rocks and boulders. From sea-level - 1,000 m.
Bicol Ground Warbler (Robsonius sorsogonensis) [XC384792]
by Ding Li Yong from Tanay, Rizal, Calabarzon, Philippines (song)
Bicol Ground Warbler (Robsonius sorsogonensis) [XC813725]
by Ding Li Yong from Real, Quezon, Calabarzon, Philippines (call, subsong)
Subspecies
Napothera rabori (Sibley and Monroe 1990, 1993) has been moved into the new genus Robsonius and split into Cordillera Ground-warbler (Robsonius rabori) and Bicol Ground-warbler (Robsonius sorsogonensis) following Collar (2006).
Previously placed in genus Napothera. Formerly regarded as conspecific with Cordillera Ground-warbler (Robsonius rabori).
The following 2 subspecies are recognised:
mesoluzonicus (Rand & Rabor, 1967) - Central Luzon, in northern Philippine Is.
sorsogonensis Rand and Rabor, 1967 - Southern Luzon and Catanduanes.