Amazonian Grosbeak is resident over much of northern South America east of the Andes, from eastern Colombia and southern Venezuela south to northern Bolivia and central Brazil. It is closely related to Blue-black Grosbeak (Cyanoloxia cyanoides) of Middle America and northwestern South America, and indeed for many years Amazonian was classified as only a subspecies of Blue-black. The distributions of the two species are largely allopatric, but they may meet very locally in eastern Colombia. Amazonian Grosbeak is similar in appearance to Blue-black Grosbeak, but the male Amazonian is brighter blue than the northern species and the female is duller and less rufous. Amazonian Grosbeak is fairly common, but it occupies relatively dense forest understory in the lowlands, and is heard much more often than it is seen. The biology of Amazonian Grosbeak presumably is very similar to that of Blue-black Grosbeak, but Amazonian is much less well known.