Concluding Remarks AcknowledgmentsP A B was supported by an

Concluding Remarks
AcknowledgmentsP.A.B. was supported by an ARC Future Fellowship. Thanks to three referees for their constructive and thoughtful comments.
Appendix. Table A1.
communication; eavesdropping; sexual selection; short-range song; social behaviour; soft 'KU60019' song
Research on acoustic communication has provided important insights into the fields of sexual selection, sensory perception and the KU60019 of behaviour (Andersson, 1994, Bradbury and Vehrencamp, 2011, McGregor, 2005 and Searcy and Nowicki, 2005). Until recently, most research on this topic has focused on high-amplitude signals that project over long distances and can simultaneously influence multiple types of receivers (Wiley and Richards, 1978 and Wiley and Richards, 1982). Because high-amplitude signals propagate widely, chlamydia can serve a variety of functions including attracting mates, competing with rivals, avoiding predators and mediating social interactions within groups (Bradbury & Vehrencamp, 2011).