Supplementary Figure 10: Vocalization spectra of bird 3 when it is close to bird 4
From: Reconstruction of vocal interactions in a group of small songbirds
(a) Vocalization spectrum recorded with microphones. Note that microphones practically do not discriminate vocalizations in proximal birds 3 and 4 (red and blue lines almost coincide). Dotted lines denote background noise. Shown are spectra of 274 vocalizations in bird 3 during which the estimated distance between the two birds was ≤ 5 cm (the distance estimate was based on relative sound amplitudes between singer and listener ≤ 3 dB). (b) Vocalization spectra of the same vocalizations recorded with accelerometers. Note that the spectrum on the vocalizer accelerometer exceeding that of all listeners by about 20 dB (at 1 kHz).
