Much confusion over species limits with regard to this and its close allies. Formerly considered conspecific with B. cornutus by some, but combined study of vocalizations and museum specimens#R supported earlier suggestions that it should be regarded as a distinct species. Sometimes treated as conspecific with B. hodgsoni, but differences in bill size and structure, development of facial bristles, relative tail length and vocalizations, and perhaps also bare-part colours (bill said to be often more straw-coloured), too great. Race affinis sometimes considered a distinct species, and recently treated as such on account of its supposedly distinctive voice#R, but analysis and publication of fuller evidence needed. Race continentalis is apparently connected to affinis by an intermediate population around Khao I Phrom, in C peninsular Thailand; this also recently treated as a full species#R, but again analysis and fuller evidence needed. Likewise, race chaseni, previously considered inseparable from affinis, now thought by some to represent a separate species on basis of some morphological and vocal characters#R. Recent claim of a new species (B. pygmaeus) from Calamian Group (Busuanga I), N of Palawan, in W Philippine Is, seems unconvincing, single specimen on which description based being little different from local chaseni. Since 2005, several observations (and photographs) of a frogmouth on island of Siberut, off W Sumatra, perhaps involve this species or B. cornutus, or alternatively an undescribed taxon#R#R; further study required. Four subspecies currently recognized.
Food and feeding
Status and conservation
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