Races apparently genetically distinct, and may represent two species#R; further study needed. Proposed race perplexa (Labuan Kelambu, in Borneo) is synonym of nominate, based on immature bird#R. Species previously listed as I. olivacea, but specific epithet (preoccupied when species included in Hypsipetes) replaced before 1961 and thus permanently invalid#R; replacement name is crypta, over which charlottae has priority as name of species. Two subspecies recognized.
Food and feeding
Status and conservation
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