Breeding: In Panama, breeding activity occurs from February through August (Wetmore et al. 1984). Nest building began early April (Skutch 1954). A neat cup, measuring about 1 5/8 to 2 1/8 inches (0.041 m to 0.054 m) in diameter by 1 ¼ inch (0.032 m) in depth, was observed about 9 m above ground (Skutch 1954). The nest often is placed in clearings in the crowns of fruit trees, and it is composed of light-colored fibers, and bound together by cobweb and spider cocoons (Skutch 1954). The nest is constructed only by the female, but she is accompanied by the male on every visit to the nest. The male waits near the site while she arranges the fibers and then follows her to gather more material. Skutch (1954) observed that, on a couple of occasions, the male would bring material on his bill but he would either drop it or carry it off again when following his mate. The clutch is two; eggs are whitish and speckled. Both parents provide parental care until the youngsters can take care of themselves. Skutch (1954) found that at least four other Plain-colored Tanagers help feed the nestlings but the relationships of these individuals to the parents was not known.