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Learned use of an innate sound-meaning association in birds

Abstract

Signals in vocal communication systems range from innate to learned. Although innate and learned signals are often assumed to be independent, Darwin speculated that they could be evolutionarily related, with the former being the foundation of the latter even in our own communication system, language. Here we test this hypothesis by studying the vocal communication systems of avian hosts of brood parasites. First, we show that 21 bird species separated by approximately 53 million years of evolution produce structurally similar ‘whining’ vocalizations towards their respective brood parasites. Exploring the social correlates of whining vocalization production, we find that species that produce this vocalization often exist in areas with dense parasite–host networks, suggesting that its production facilitates interactions among host species. Experiments across three continents show that this vocalization is referential towards brood parasites in multiple host species, that hearing them elicits an innate rapid recruiting response, and that host species from different continents respond equally to the whining vocalizations of each other, indicating that convergent use facilitates cooperative defences across species. Our results provide an example of a referential animal vocalization for which sound production in the correct context is learned but for which hearing it elicits an innate response, representing an intermediate between innate and learned signals.

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Fig. 1: Evolutionary history of vocalizations by hosts of brood parasites and macroecological correlates of whining vocalization production.
Fig. 2: Whining vocalizations are functionally referential in superb fairy-wrens and white-browed scrubwrens and attract the attention of nearby passerines.
Fig. 3: Whining vocalizations elicit an equivalent behavioural response at sympatric and allopatric host nests.

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Data availability

Datasets used in this study are available in the Supplementary Data.

Code availability

An R script containing all the codes used for statistical analyses is available in the Supplementary Code.

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Acknowledgements

This work was supported by the Alexander von Humboldt Foundation (to W.E.F. and M.E.H.), Birds Queensland (to W.E.F. and M.S.W.), the British Trust for Ornithology (to W.E.F.), the Hermon-Slade Foundation (no. HS15/1 to W.E.F.), Griffith University and the University of Queensland (to W.E.F.), a Whitten PhD Studentship in the Department of Zoology, University of Cambridge (to J.A.K.), a Clare Hall Research Award, University of Cambridge (to J.A.K.), an Edward W. Rose Postdoctoral Fellowship in the Cornell Lab of Ornithology for part of this work (to J.A.K.), the US National Science Foundation (no. 1353681 to M.S.W., no. 1953226 to M.E.H. and no. 1952726 to S.A.G.), the National Key R & D Program of China (2023YFF1304600 to W.L.), the National Natural Science Foundation of China (32270526 and 32470513 to W.L.), the National Geographic Society (NGS-60453R-19 to M.E.H.), the Australian Research Council (FT110100505 and DP150103595 to A.P.), the Australian Wildlife Conservancy (to N.T. and A.P.), a Royal Society Dorothy Hodgkin Fellowship (to C.N.S.), a Biotechnology and Biological Sciences Research Council David Phillips Research Fellowship (BB/J014109/1) (to C.N.S.), the National Agency for the Promotion of Science and Technology (ANPCyT), National Science Centre, Poland (grants 2012/05/E/NZ8/02694, 2016/23/B/NZ8/03082 and 2022/45/B/NZ8/03740 to A.A., R. Gula and J.T.), and the National Scientific and Technical Research Council (CONICET) (to V.D.F.). We also thank E. Miller for sharing pipelines, which helped with constructing phylogenetically corrected linear models, as well as B. Kempenaers, C. Riehl and J. Fischer for comments on the manuscript. Finally, we thank all our field assistants (E. Aarsvold, A. Branney, R. Bracken, C. Brock, J. D. Brooks, M. Chan, L. Clarke, J. Cosentino, Z. Davis, W. Deptula, B. Donnelly, V. Drolet-Gratton, S. Dougill, R. Green, D. Erickson, M. Freeby, D. Ferraro, L. Fried, J. Grayum, K. Gielow, M. Grundler, J. Grudens, C. Hawey, N. Hunt, L. Huntsmith, O. Kashembe, S. LeQuier, L. Lichtenauer, M. Marsh, A. Miller, C. Moya, S. Mwanza, J. Platzer, R. Neil, A. Sargent, M. Scheuering, D. Thrasher, D. Tolman, R. Weisbeck, J. Welklin, A. Werrell, J. Upton and E. Zarri) for their time and expertise, without which this research would not have been possible.

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Contributions

W.E.F. conceived the study with input from J.A.K., D.W., D.E.B., A.M., W.L. and M.S.W. W.E.F., J.A.K., B.Z., S.L.L., J.K.E., N.M.R., N.T., M.A., S.A.G., V.D.F., J.B., M.Z., A.A., R. Gula, J.T. and M.E.H. collected the data. W.E.F., J.A.K., A.M. and D.W. implemented the analyses. W.E.F., J.A.K., D.W. and D.E.B. wrote the manuscript with input from all authors.

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Correspondence to William E. Feeney.

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Extended data

Extended Data Fig. 1 Vocalization spectrograms.

Representative spectrograms of vocalizations of 26 species, grouped by family, included in the study produced in response to either predators or brood parasites. Top row, from left: brown thornbill (Acanthiza chrysorrhoa), fan-tailed gerygone (Gerygone flavolateralis), white-browed scrubwren (Sericornis frontalis), great reed warbler (Acrocephalus arundinaceus), oriental reed warbler (Acrocephalus orientalis), common tailorbird (Orthotomus sutorius), rufescent prinia (Prinia rufescens), tawny-flankd prinia (Prinia subflava), purple-crowned fairy-wren (Malurus coronatus), superb fairy-wren (Malurus cyaneus), variegated fairy-wren (Malurus lamberti), yellow-faced honeyeater (Caligavis chrysops), brown honeyeater (Lichmera indistincta), noisy friarbird (Philemon corniculatus). Bottom row, from left: chalk-browed mockingbird (Mimus saturninus), yellow warbler (Setophaga petechia), Hume’s leaf warbler (Phylloscopus humei), Ijima’s leaf warbler (Phylloscopus ijimae), western crowned warbler (Phylloscopus occipitalis), buff-barred warbler (Phylloscopus pulcher), mountain chiffchaff (Phylloscopus sindianus), greenish warbler (Phylloscopus trochiloides), willow warbler (Phylloscopus trochilus), Japanese leaf warbler (Phylloscopus xanthodryas), grey-hooded warbler (Phylloscopus xanthoschistos), grey fantail (Rhipidura albiscapa). Color above spectrograms denote vocalization type as in Fig. 1 in the main text. Green: alarm; blue: ‘whining’; yellow: ‘seet’; ‘red’: no unique vocalization.

Extended Data Fig. 2 Estimating the correlation between whining vocalization behaviour and linkage density.

Distribution of posterior means (N = 4,000 posterior samples per tree) obtained following MCMC sampling in a Bayesian threshold model to estimate the evolutionary correlation between the presence of the whining vocalization behaviour in a species and the median linkage density across the species’ range. MCMC sampling was conducted over 5,000,000 iterations with a thinning rate of 1000. The first 20% of iterations (1,000,000 iterations) was discarded as burn-in. The analysis was conducted using 1,000 randomly sampled trees based on the Hackett backbone, and 1,000 randomly sampled trees based on the Ericson backbone. Of these trees, 970 and 985 out of 1000 trees, respectively, had posterior distributions excluding zero.

Extended Data Fig. 3 Phylogeny of species that attended cuckoo model presentation trials or were detected in the vicinity of nests during point counts but did not attend the trial.

For each species it is denoted whether it is known to be a host species of a brood parasite, and whether the species belongs to the order Passeriformes (passerines) which includes the species most frequently parasitized by brood parasitic cuckoos and species known to produce whining vocalizations, or not (non-passerines).

Extended Data Fig. 4 Yellow warbler responses to playbacks.

Responses of yellow warblers (Setophaga petechia) towards 30 s playbacks of brood parasite-context whining vocalizations by superb fairy-wrens (Malurus cyaneus), conspecific predator-context chip, conspecific brood parasite-context seet vocalizations and wood thrush (Hylocichla mustelina) song, a non-threatening control (N = 14 for all treatments). Generalized linear mixed models were used (see Methods for more detail on statistical procedures). Boxes denote median and interquartile ranges, whiskers denote 1.5x interquartile range, and dots indicate data that lies outside of 1.5x interquartile range.

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Feeney, W.E., Kennerley, J.A., Wheatcroft, D. et al. Learned use of an innate sound-meaning association in birds. Nat Ecol Evol (2025). https://doi.org/10.1038/s41559-025-02855-9

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