Dusky Spinetail Synallaxis moesta

An exceptionally shy spinetail found in cloud forest along the east slope of the Andes, ranging into lowland forest in some areas. Plumage is dark gray with a black throat and chestnut crown, wings, and tail. In central Colombia, birds are somewhat paler. Inhabits dense tangles in forest understory, where it is very hard to see. Usually first detected by its song, a low, guttural trill.