Fig. 2: Acoustic features in response to predator threat and information source.
From: Nuthatches vary their alarm calls based upon the source of the eavesdropped signals
Acoustic parameters of nuthatch mobbing calls depend both on the threat level of the predator and the source of the information. Mean ± standard error of red-breasted nuthatch a call rate (calls/bird/minute), b peak frequency (kHz), and c call length (s) of mobbing calls produced in response to control (grey triangles), direct information (blue circles), and indirect information (orange squares). Source data are provided as Supplementary Data 1.
