Family Grasshopper-warblers and Grassbirds (Locustellidae)

Near Threatened

Bicol Ground-warbler (Robsonius sorsogonensis)


Taxonomy

French: Robsonie du Sorsogon German: Braungesicht-Grundsänger Spanish: Ratina de Rand
Other common names: Grey-banded Babbler
Taxonomy:

Napothera sorsogonensis

Rand and Rabor

, 1967,

Mount Bulusan, San Roque, Bulusan, Sorsogon Province, southern Luzon, Philippines

.

Formerly regarded as conspecific with R. rabori (and the then undescribed R. thompsoni); the remark that these three taxa, and in particular the present form, are “PSC species”#R misrepresents the degree of differentiation involved. Name mesoluzonica given to birds in N of range, shown to be a synonym#R. Monotypic.

Distribution:

C & S Luzon and Catanduanes, in NC Philippine Is.

Descriptive notes

20–22 cm; 57–65 g. Nominate race has forehead greyish olive, shading on crown to olive, all with faint dark scales; mantle and upper back olive with faint narrow... read more

Voice

Song a very high, thin, high-pitched “tit’tsu—tsuuuu-tsiiiiii” (third and fourth notes higher,... read more

Habitat

Broadleaf evergreen forest, forest edge, secondary growth, vicinity of limestone rocks and outcrops... read more

Food and feeding

Stomach of one specimen held insects; presumably many types of invertebrate taken. Forages on ground, walking slowly across forest floor,... read more

Breeding

Feb–Aug, with a dependent fledgling observed in late Feb. Nest a large ball with large front entrance, placed 0·6–0... read more

Movements

Resident.

Status and conservation

Not globally threatened. Currently considered Near Threatened. Restricted-range species: present in Luzon EBA. Status difficult to determine owing to secretive habits.... read more

Recommended citation

Collar, N., Robson, C. & Sharpe, C.J. (2018). Bicol Ground-warbler (Robsonius sorsogonensis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/59521 on 25 June 2018).