Figure 1. This series of evenly spaced click-like notes is the "loudsong" of the species. To a human listener, the vocalization does not sound like a song, but in playback experiments, it evokes a similar behavioral response as loudsongs in other Typical Antbirds, e.g. F. melanogaster or Thamnophilus pelzelni: the male appears, utters the same song, and searches nervously for the vocalizing conspecific.

See species account in Zimmer and Isler 2003: "... loudsong a monotonous series of dry or harsh notes repeated at same pitch and pace ...". See also CD of Isler and Whitney 2002, CD 2 Track 18, for a similar sample.

Fig. 2 shows details of section "A".

Figure 2. Details of section "A" from fig. 1.

The song of the congeneric F. melanogaster sounds rather different, but is remotely similar in structure: In both cases, there is a series of distinct notes, and the individual notes are of similar duration (ca. 50-70 ms), and consist of a frequency-modulated fundamental and harmonics. However, F. melanogaster issues soft notes at rapid pace and variable pitch, while F. grisea utters harsh notes, at a slower, very steady pace, and steady pitch.