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Language, whether spoken, signed, or written, consists of specific components: lexicon and grammar. The lexicon is the vocabulary of a language, comprising its words. Grammar is the set of rules used to convey meaning through the lexicon. For example, English grammar adds “-ed” to most verbs to indicate past tense. Words are formed by combining phonemes, which are the basic sound units of a language. Different languages have different sets of phonemes (e.g., “ah” vs.
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Related Experiment Video

Updated: Dec 29, 2025

A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae
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Do penguins' vocal sequences conform to linguistic laws?

Livio Favaro1,2, Marco Gamba2, Eleonora Cresta3

  • 1Equipe de Neuro-Ethologie Sensorielle ENES/CRNL, University of Lyon/Saint-Etienne, CNRS UMR5292, INSERM UMR_S 1028, Saint-Etienne, France.

Biology Letters
|February 6, 2020
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Summary

African penguins

Keywords:
acoustic sequencesbioacousticscompressioninformation theoryseabirds

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Area of Science:

  • Bioacoustics
  • Animal Communication
  • Linguistics

Background:

  • Information compression is a key principle in human language, observed in Zipf's Law of Brevity and the Menzerath-Altmann Law.
  • Previous studies indicated these laws apply to non-human primate vocalizations, suggesting broader applicability.

Purpose of the Study:

  • To investigate whether African penguin display songs conform to Zipf's Law of Brevity and the Menzerath-Altmann Law.
  • To explore information compression principles in a non-primate vocal sequence.

Main Methods:

  • Analysis of African penguin display songs, which consist of three syllable types.
  • Statistical examination of syllable frequency, length, and constituent duration in relation to song size.

Main Results:

  • The shortest syllable type was found to be the most frequent, aligning with Zipf's Law of Brevity.
  • A negative correlation between constituent duration and song size was observed, consistent with the Menzerath-Altmann Law.

Conclusions:

  • This study presents the first evidence of Zipf's and Menzerath-Altmann Laws in a non-primate species' vocalizations.
  • These findings suggest that information compression principles are conserved across diverse species and can coexist with species-specific ecological pressures.