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Two Rooks Changed Their Vocal Timing With Rhythmic Sounds but Did Not Match the Beat

Adult rook standing on grass with an unobstructed head and body
Research · Behaviour

A 2026 experiment found that individual rooks (Corvus frugilegus) could alter parts of their vocal timing when exposed to rhythmic sound sequences that were not biologically meaningful to them, although the birds did not precisely match the beat. The study tested spontaneous responses rather than training the birds to synchronise.

Researchers worked with 11 adult rooks housed in an outdoor aviary in Strasbourg, France. The birds had originally been taken from wild colonies around Strasbourg as juveniles and hand-raised. During trials, a bird could voluntarily approach a small “sound shower” that played sequences built from running-water or toy-drone sounds. The sequences varied across four tempos and three metrical patterns.

Only three birds provided enough data for broad comparison

Eight of the 11 birds sang while listening to the stimuli, but only three produced enough responses for analysis across most tempos and rhythmic patterns. Two of those three showed clear condition-specific changes. One bird produced shorter vocalisations at slower tempos, while another shortened the intervals between vocalisations during a slow, evenly pulsing sequence. None of the birds aligned the onset of their calls precisely with the beat.

The authors therefore describe the results as evidence of vocal flexibility rather than demonstrated rhythmic entrainment. They note that the birds were not conditioned or rewarded for matching the sounds, so the changes arose spontaneously during voluntary participation in the trials.

Sources and image credit

  1. Martin, K., Tomasek, M., Hivet, A., Ravignani, A., Obin, N., & Dufour, V. (2026). Rooks (Corvus frugilegus) can show spontaneous vocal flexibility when exposed to dynamically changing rhythmic sounds. Animal Cognition, 29, 18. https://doi.org/10.1007/s10071-025-02038-wPrimary open-access research article published 26 January 2026. Eleven adult captive rooks in Strasbourg were exposed voluntarily to rhythmic sound sequences varying in tempo and metre. Eight birds sang during stimuli; three provided enough data for broad analysis, and two changed aspects of vocal timing under particular conditions without precisely matching the beat.

Image: Hobbyfotowiki / Wikimedia Commons — adult rook (Corvus frugilegus) photographed in Travemünde, Germany, 19 October 2018. Illustrative species photograph, not one of the experimental birds. · CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/ · Source

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