The breeding season of Talamanca Hummingbird in Costa Rica extends from November to March (Stiles and Skutch 1989). The nest is a "bulky cup of soft plant down, fine fibers, and rootlets", and the outer surface of the cup is covered with moss and bits of lichen (Stiles and Skutch 1989). Nest dimensions (n = 3) are: external diameter 8.0-9.0 cm; internal diameter 3.5-4.0 cm; and external depth 4.0-4.5 cm. (Powers 2013) The nest is placed 1.5-3 m above the ground, usually at the tip of a descending stem of bamboo in the forest understory or at the edge of a small gap in the forest (Stiles and Skutch 1989, Powers 2013). The clutch is two, and the nestling period is ≥ 25 days (Powers 2013).