Ramphotrigon fuscicauda, Chapman, 1925

Pedroza, Diego, Melo, Tomaz Nascimento de, Machado, Tatiana Lemos da Silva, Guimarães, David Pedroza, Lima, Jônatas M. & Guilherme, Edson, 2020, Birds of Humaitá Forest Reserve, Acre, Brazil: an important forest fragment in south-west Amazonia, Bulletin of the British Ornithologists’ Club 140 (1), pp. 58-79 : 63

DUSKY-TAILED FLATBILL Ramphotrigon fuscicauda

Species associated with bamboos. Guilherme (2009) was the first observer to record R. fuscicauda in HFR. Ecologically more flexible than R. megacephalum , it occurs in both bamboo-dominated habitats and areas without bamboo, although it is commonly found on bamboo, and is observed foraging close to R. megacephalum ( Melo & Guilherme 2016) . Density of R. fuscicauda along a 10-km transect in HFR was estimated at 0.8 individuals/km 2. DPG considered this species to be another constant participant in mixed-species flocks led by Thamnomanes schistogynus .