The genus Chlorochrysa, with three species: C. phoenicotis, C. calliparaea, and C. nitidissima, is distributed throughout the Andes from Colombia to northern Bolivia inhabiting mossy cloud forests between 900–2400 m. We describe for the first time the reproductive biology of the C. nitidissima and the use of different nesting sites. This study was conducted at three sites located on the eastern slope of the Western Cordillera in Colombia. The shallow cup nests were built with small thin sticks and dry bamboo leaves, placed inside hanging mossy clumps located on horizontal branches or inside abandoned dome-shaped songbird nests. We report a clutch size of one white, oval egg with brown spots, which measured 21.45 × 15.0 mm and weighted 2.3 g (n = 2). The average nestling period was 23 days, and the nestling growth rate (K) was, on average, 0.29. Finally, these results could be used to implement plans for the conservation of this endemic and critical endangered species.