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As an introductory note, it should be said that voice of most if not all Thistletails is at least structurally very similar, and seemingly in this genus is not a good indicator for speciation. Song of most Thistletails is a series of gradually rising and accelerating notes changing to a descending trill (e.g. Ochre-browed Thistletails S. coryi, Mouse-coloured Thistletail S. griseomurina). Some species however seem to mainly or exclusively sing just a rising/falling trill (e.g. Eye-ringed Thistletail S. palpebralis). And some species seem to have both vocalisations (e.g. White-chinned Thistletail S. fuliginosa), and thus maybe all Thistletails do, but just the rate of delivery is different, or it is somewhat linked to subspecific taxa of that species (not investigated) (Fig. 1).

98. Notes on the vocalizations of Vilcabamba Thistletail (Schizoeaca vilcabambae)