Figure 1. Vocalization produced by a Brown-crested perching on a tree branch, when a Spot-backed Puffbird arrived to chase him away. Lanyon 1978 called this kind of sound the "rapid huit call", see his fig. 83. The labels "N" indicate the song of the Spot-backed Puffbird. See fig. 2 for details of section with label A.

Figure 2. Details of section "A" from fig. 1. This is a "rapid huit call" followed by a rasp. Compare with Lanyon 1978, Fig. 83, numbers (8)-(15) and (16)-(19).