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Difficulties when Assessing Birdsong Learning Programmes under Field Conditions: A Re-Evaluation of Song Repertoire Flexibility in the Great Tit
- Hector F. Rivera-Gutierrez,
- Rianne Pinxten,
- Marcel Eens
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- Published: January 17, 2011
- https://doi.org/10.1371/journal.pone.0016003