Female koalas prefer bellows in which lower formants indicate larger males

@article{Charlton2012FemaleKP,
  title={Female koalas prefer bellows in which lower formants indicate larger males},
  author={Benjamin D. Charlton and William A. H. Ellis and Jacqui Brumm and Karen Nilsson and W. Tecumseh Fitch},
  journal={Animal Behaviour},
  year={2012},
  volume={84},
  pages={1565-1571}
}
Free-Ranging Male Koalas Use Size-Related Variation in Formant Frequencies to Assess Rival Males
TLDR
The results indicate that male koalas invest more effort into their vocal responses when they are presented with bellows that have lower formants indicative of larger rivals, but also show that males are slower to engage in vocal exchanges with larger males that represent more dangerous rivals.
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An inter-specific investigation into correlations between the minimum fo produced by the sound source, body size and vocal fold length found that, across species, VFL predicted minimum fo much better than body size, clearly demonstrating the potential for decoupling between larynx size and body size in primates.
The Role of Bioacoustic Signals in Koala Sexual Selection: Insights from Seasonal Patterns of Associations Revealed with GPS-Proximity Units
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It is concluded that indirect male-male competition, female mate choice, and possibly female competition, mediate sexual selection in koalas.
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These results provide clear evidence that male koalas perceive and attend to size-related formant information in their own species-specific vocalisations and suggest that formant perception is a widespread ability shared by marsupials and placental mammals, and perhaps by vertebrates more widely.
Cues to body size in the formant spacing of male koala (Phascolarctos cinereus) bellows: honesty in an exaggerated trait
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The findings show that the formant spacing of male koala bellows has the potential to provide receivers with reliable information on the caller's body size, and reveal that vocal adaptations allowing callers to exaggerate (or maximise) the acoustic impression of their size have evolved independently in marsupials and placental mammals.
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The findings indicate that male koala bellows are highly individually distinctive and that the identity of male callers is functionally relevant to male and female koalas during the breeding season.
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The response of oestrous red deer hinds to playback of re-synthesized male roars characterized by either higher than average or lower than average F0 is investigated, providing the first evidence of such a bias in nonhuman mammals.
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TLDR
Findings indicate that free-ranging red deer hinds may use formants as acoustic cues to gauge the body size and maturity of males in their natural environment, possibly to facilitate earlier detection and avoidance of young stags that are known to harass them.
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Female red deer prefer the roars of larger males
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