Table 4: Comparison of the songs in Part I that are not a trill or churr, elements upslur, tempo is steady, pitch is steady, elements are not spoken, and song is composed of one whistle.

Species Relative sharpness (1–4; 1 = least) Relative clarity (1–3; 1 = nasal, 3 = clear) Relative length of first element (1–4; 1 = shortest)
Black-striped Woodcreeper* 4 1 4
Great Crested Flycatcher* 3 1 2
Brownish Twistwing* 2 1 3
Forest Elaenia* 2 2 1
Paltry (or Mistletoe) Tyrannulet 1 3 2
Swainson’s Thrush 2 2 1

* Elements upslur only, unlike somewhat similar-sounding song of Eastern Wood-Pewee, which down/upslur