Note on the Characteristics of the Nest of the Southern Beardless-Tyrannulet (Campostoma obsoletum)

This paper describes 3 nests of the Southern Beardless Tyrannulet (Camptostoma obsoletum), found in the Córdoba province (Argentina). The nests were built in a clump of epiphytic bromeliads and were difficult to detect. The nest lining also included the plumed seeds of the supporting bromeliads. In one nest, both sexes cooperated in nest building, which lasted approximately 5 days.