Fig 1.
A typical chickadee alarm call consisting of introductory notes and D-notes.
Figure spans a duration of 1.6 seconds (x-axis) and a frequency range of 0–10 kHz (y-axis). Peak frequency values of introductory and D-notes were identified by Raven as the location of each note type where amplitude was the highest (i.e., the darkest in our figure).
Table 1.
Chickadee alarm call components compared in noise and control trials using t-tests.