Loud song of Herpsilochmus atricapillus. One of the common
sounds in the hills of Mãe-da-lua reserve.
The spectrogram is similar to the one in
Whitney et al. 2000
(Fig. 6 D, see also table 2).
This vocalization is
sometimes called a "rattle". Similar to Fig. 7E in
Whitney et al. 2000.