Until recently, considered conspecific with C. wilsonii, which now is considered a full species because it differs from present species in having an all-yellow bill (3); larger bill (at least 1); barred collar (2); and smaller overall size (at least 1). Molecular evidence supports this split#R. Large-billed forms have been suggested as forming a separate species (C. megarhynchus), but this view now discredited because differences are due to individual variation. Mexican birds traditionally awarded separate race, aquilonis, supposedly more broadly barred below and with somewhat darker grey and brown morphs#R, but considerable individual variation (both in Mexico and elsewhere) indicates that subspecific status is not merited, a view supported by molecular analysis#R. Two subspecies recognized.
Food and feeding
Status and conservation
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