There is very little information on the breeding biology of Amazonian Grosbeak. A nest under construction was discovered in Colombia in February (Hilty and Brown 1986), and five nests are reported from Belém, Pará, Brazil from January to June (Pinto 1953, Oniki and Willis 1984). The nest is placed among vines or in the crown of a small palm, ca 1.5-2 m above the ground. The nest is a cup; the dimensions of one nest were 15 (diameter) x 13 (height) cm (exterior) and 8 (diameter) x 9 (height) cm (interior) (Oniki and Willis 1984). The nest is composed of dried leaves, such as palm leaves mixed with stems of a fern (Polypodium cilatum), and lined with Polypodium stems mixed with blackish brown rhizomorphs. The clutch is two. The eggs are creamy white, with dark brown spots, concentrated around the larger end, and are ca 17 x 23 mm in size. Both sexes incubate. There is no information on the length of incubation or of the nestling period.