Hitherto treated as monotypic, with races concolor (plus relicta and aequatorialis) and carrizalensis as separate species, but while relicta is here separated as a full species the other taxa appear to be very weakly differentiated: available acoustic evidence reveals identical songs#R, while plumage and mensural differences are all minor, with the possible exception of the larger bill of carrizalensis; moreover, new records from Brazil as far N as Maranhão suggest that populations of Amaurospiza may generally be more widespread and less disjunct than range maps indicate, as seems often the case with bamboo specialists. Genetic evidence suggests that race concolor is more distantly related to aequatorialis than the latter is to carrizalensis and moesta#R. Four subspecies recognized.
Food and feeding
Status and conservation
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