Figure 1: Sound spectrograms of call treatments played to Japanese great tits.
From: Experimental evidence for compositional syntax in bird calls
(a) ABC call is composed of single A, B and C notes. (b) D call is composed of seven to ten D notes. (c) ABC–D call is the combination of ABC and D calls. (d) D–ABC call is a reversed combination of ABC and D calls. These calls were digitally edited using Raven Pro 1.3 software.
