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Souriau A, Geberzahn N, Ivanitskii VV, u. a. Singing behind the stage: thrush nightingales produce more variable songs on their wintering grounds.  2019. Available at: http://link.springer.com/10.1007/s00265-019-2765-x.\par \par van Boheemen SJ, Dibl\'edkov\'e1 L, B\'edlkov\'e1 J, Petrusek A, Petruskov\'e1 T. Extraordinary variation in a simple song: No geographical patterns in initial phrase variation of the Yellowhammer, a passerine with pronounced dialectsAbstract.  2019. Available at: https://academic.oup.com/auk/article/doi/10.1093/auk/ukz055/5601449.\par \par }