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FIGURE 8.1 Selection on acoustic signals through sexual selection illustrating the potential for long and complex calls. Counter selection through energy costs and predation results in signal reduction and duetting, but the evolution of duetting behaviour may possibly increase selection on call length and also male competition.

FIGURE 8.1 Selection on acoustic signals through sexual selection illustrating the potential for long and complex calls. Counter selection through energy costs and predation results in signal reduction and duetting, but the evolution of duetting behaviour may possibly increase selection on call length and also male competition.

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