Alström et al., 2009,
Phong Nha-Ke Bang National Park, Quang Binh Province, Central Annam, Vietnam.
Related to P. ricketti and P. cantator; closest to latter on molecular evidence, but more similar to former in plumage pattern and in yellow colour of belly. Acknowledged by describers#R (all mensural analysis here based on their data) that all three forms might be united in one species, but present species differs from P. ricketti in its marginally colder yellow underparts and more greyish-tinged upperparts with marginally greyer lateral crownstripes (1); shorter wing (effect size for males −2.8, score 2); longer bill (effect size for males 1.48, score 1); lower-pitched song (minimum frequency 3 vs 4 kHz) (2) with fewer repeat phrases (1); also very different calls (ns). Differs from P. cantator in its yellow vs white belly (3); shorter wing (effect size for males −0.88, score 1); longer bill (effect size for males 1.86, score 1); lower-pitched song (minimum frequency 3 vs 4 kHz) (2) with steeply downslurred final note (1). Description in Jan 2010 issue of journal, but first published in Dec 2009. Monotypic.
Limestone karst regions of N & C Vietnam and N & C Laos, extending also into karst areas in extreme S China (Guangxi).
Food and feeding
Status and conservation
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