Traditionally considered to form a species-group with O. semitorques, O. lettia, O. lempiji, O. megalotis, O. nigrorum, O. everetti, O. fuliginosus and O. mentawi. Taxonomy complex and controversial, with various treatments by different authors: often considered to include one, or several, or all of above-mentioned species as races; sometimes regarded as conspecific with O. lempiji; or as monotypic, with all other currently recognized races placed with O. lettia; boundaries between all taxa poorly understood. Present treatment based mainly on vocalizations. Formerly considered to include race plumipes of O. lettia (which see). Proposed form malabaricus (S Western Ghats) usually synonymized with nominate, but perhaps worth investigating. Four subspecies recognized.
Food and feeding
Status and conservation
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