Figure 1.

Spectrograms of exemplars of playback treatments. (a) Control: thornbill song then a different thornbill song. (b) Mobbing–mobbing: thornbill mobbing alarm then mimicry of honeyeater mobbing alarm. (c) Aerial–mobbing: thornbill aerial alarm then mimicry of honeyeater mobbing alarm. (d) Aerial–aerial: thornbill aerial alarm then mimicry of honeyeater aerial alarm. Mimicry was of New Holland honeyeaters. Spectrograms from Raven Pro 1.5, with Blackman window function and 512 sample window size, using electronic supplementary material, audio S1–S4.