Acoustic interaction 6 Mathematical models 6 Birds 4 Acoustic generators 2 Acoustic signature 2 Acoustic waves 2 Acoustics 2 Air Pressure 2 Animals 2 Behavioral research 2 Biodiversity 2 Biological Clocks 2 Biomechanics 2 Bird species 2 Birdsong 2 Complex behavior 2 Complex sounds 2 Computer Simulation 2 Coupled systems 2 Delay differential equations 2 Differential equations 2 Dynamical systems 2 Feedback 2 Fundamental frequencies 2 Models, Biological 2 Nonlinear Dynamics 2 Nonlinear effect 2 Nonlinear features 2 Nonlinear systems 2 Oscillatory solutions 2