Dear Marmam subscribers, We are pleased to announce the publication of the following article in Scientific Reports journal Romagosa, M., Baumgartner, M., Cascão, I. et al. Baleen whale acoustic presence and behaviour at a Mid-Atlantic migratory habitat, the Azores Archipelago. Sci Rep 10, 4766 (2020). https://doi.org/10.1038/s41598-020-61849-8 The identification of important areas during the annual life cycle of migratory animals, such as baleen whales, is vital for their conservation. In boreal springtime, fin and blue whales feed in the Azores on their way to northern latitudes while sei whales migrate through the archipelago with only occasional feeding. Little is known about their autumn or winter presence or their acoustic behaviour in temperate migratory habitats. This study used a 5-year acoustic data set collected by autonomous recorders in the Azores that were processed and analysed using an automated call detection and classification system. Fin and blue whales were acoustically present in the archipelago from autumn to spring with marked seasonal differences in the use of different call types. Diel patterns of calling activity were only found for fin whales with more calls during the day than night. Sei whales showed a bimodal distribution of acoustic presence in spring and autumn, corresponding to their expected migration patterns. Diel differences in sei whale calling varied with season and location. This work highlights the importance of the Azores as a migratory and wintering habitat for three species of baleen whales and provides novel information on their acoustic behaviour in a mid-Atlantic region. The publication is available online at: https://www.nature.com/articles/s41598-020-61849-8 Kind regards, -- Miriam Romagosa PhD candidate IMAR - Institute of Marine Research & Okeanos I & D Centre DOP - Department of Oceanography and Fisheries University of the Azores Rua Professor Dr. Frederico Machado 4 9901-862 Horta Portugal