Violet-throated Metaltail Metallura baroni is a threatened hummingbird species, endemic to the Andes of southern Ecuador. Details about the reproductive biology of this species are largely unknown. In this manuscript, we describe the nest, eggs, and nestlings"™ development based on nine nests found along with the Cuenca-Molleturo-Naranjal road, in Cajas National Park, in 2019. We document a breeding period from March to May, which corresponds to the rainy season. All nests were found in roadside embankments, and were constructed with mosses, small twigs, rootlets, Polylepis sp. (Rosaceae) bark, and Puya sp. (Bromeliaceae) fibers. In all nests, we found two white oval eggs that were exclusively attended by a female across the breeding period. Hatching to fledging period lasted 28-32 days. Nesting at roadsides can be particularly risky due to a high probability of collision with vehicles; thus, an assessment of the breeding success of M. baroni on nests located at roadsides is a research priority for this species. The information provided here increases the knowledge about the natural history of M. baroni.

Resumen ∙ Se presenta nueva información sobre la biología reproductiva del Dacnis Andino Norteño (Xenodacnis petersi). En Ecuador esta especie se encuentra en los altos Andes, principalmente en el Parque Nacional Cajas, donde encontramos cinco nidos entre septiembre de 2017 y noviembre de 2018. Los nidos en forma de taza estaban construidos en cuatro plantas diferentes, con la pubescencia de las flores de Puya sp., musgo, paja y ramas secas como materiales principales. El tamaño de la puesta fue de uno a dos huevos y se colocaron en días consecutivos. La hembra estuvo a cargo de la incubación, mientras que ambos sexos se hicieron cargo de las crías. La incubación duró entre 17 y 20 días, y los polluelos permanecieron en el nido durante 16 a 18 días. Abstract ∙ First nesting description of the Streaked Dacnis (Xenodacnis petersi) in Ecuador Here we report new information on the reproductive biology of the Streaked Dacnis (Xenodacnis petersi). In Ecuador, this species is found in the high Andes, mainly in Cajas National Park, where we found five nests between September 2017 and November 2018. The cup-shaped nests were built on four different plants, with the pubescence of flowers of Puya sp., moss, straw and dry branches as the main materials. Clutch size was one or two eggs and these were laid on consecutive days. The female was in charge of the incubation, while both sexes took care of the chicks. Incubation lasted between 17 to 20 days, and the chicks remained in the nest for 16 to 18 days.