Dear colleagues, My co-authors and I are pleased to announce the publication of our new article on bowhead whale songs: Erbs, F., van der Schaar, M., Weissenberger, J. et al.*Contribution to unravel variability in bowhead whale songs and better understand its ecological significance*. Sci Rep 11, 168 (2021). https://doi.org/10.1038/s41598-020-80220-5 *Abstract* Since the first studies on bowhead whale singing behaviour, song variations have been consistently reported. However, there has been little discussion regarding variability in bowhead whale singing display and its ecological significance. Unlike the better studied humpback whales, bowhead whales do not appear to share songs at population level, but several studies have reported song sharing within clusters of animals. Over the winter season 2013–2014, in an unstudied wintering ground off Northeast Greenland, 13 song groups sharing similar hierarchical structure and units were identified. Unit types were assessed through multidimensional maps, showing well separated clusters corresponding to manually labelled units, and revealing the presence of unit subtypes. Units presented contrasting levels of variability over their acoustic parameters, suggesting that bowhead whales keep consistency in some units while using a continuum in values of frequency, duration and modulation parameters for other unit types. Those findings emphasise the need to account for variability in song analysis to better understand the behavioural ecology of this endangered species. Additionally, shifting from song toward units or phrase-based analysis, as it has been suggested for humpback whales, offers the opportunity to identify and track similarities in songs over temporal and geographical scales relevant to population monitoring. The open-access article can be downloaded from https://www.nature.com/articles/s41598-020-80220-5 <https://www.nature.com/articles/s41598-020-80220-5> Please feel free to contact me (florence.erbs@upc.edu) if you have any questions. Best wishes, Florence -- UPC Icon *Florence Erbs* Laboratory of Applied Bioacoustics (LAB) Rambla Exposició, 24 | 08800 Vilanova i la Geltrú Barcelona, Spain Office +34 93 896 72 27 florence.erbs@upc.edu <mailto:florence.erbs@upc.edu> lab.upc.edu <http://www.lab.upc.edu/>, listentothedeep.com <http://www.listentothedeep.com/> -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus