Animals & nature · 2020
Do African penguins use short sounds more often, especially in longer songs?
Yes. In the African penguin display songs studied, the shortest sound type occurred most often, and longer songs contained a greater proportion of that short sound. The average sound duration therefore decreased as songs grew larger—not because every sound type became shorter.
Details
Researchers examined African penguin display songs, which help with recognition, mate choice and territorial defence. These long, loud songs combine three types of sound units. The study asked whether their structure followed patterns also found in human language: shorter units occur more often, and larger sequences have shorter units on average.
The songs matched both patterns. Crucially, the lower average sound duration in larger songs reflected a change in the mix of sound types, rather than shortening across all types. This preserved the body-size information conveyed by the duration of the longest sound type.
The authors suggest that repeating the shortest sound may help signals get through in crowded environments, but that explanation remains a possibility rather than a demonstrated effect. The findings concern the structure of these display songs; they do not establish how penguins distinguish family members' calls. The abstract does not report the sample size or recording conditions.
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