Dear Colleagues, We are pleased to share with you our new publication: Giardino GV, Mandiola MA, Bastida J, Gana JCM, Bastida RO, Rodríguez DH. 2022. *Not friends, just roommates: social organisation of two South American sea lion non-breeding colonies*. New Zealand Journal of Marine and Freshwater Research.1-16. https://www.tandfonline.com/doi/full/10.1080/00288330.2022.2034653?scroll=to... Any questions, comments, as well as the full text are available by writing to oflavescens@gmail.com. Thank you for your attention Have a nice weekend Gisela *ABSTRACT: * Groups of male South American sea lions (Otaria flavescens; SSLs) congregate in harbours on the northern coast of Argentina. These groups are very dynamic, with a high degree of habituation to human activities and the ability to colonise different types of artificial substrates, making them an interesting subject for understanding individual association patterns and spatiotemporal variations in this species. In the present study, we recorded the associations between individual bleach-marked SSLs in the harbours of Mar del Plata (PM) and Puerto Quequén (PQ) on four different substrate types during four non-breeding seasons. We found that the association pattern differed between the harbours, with a well-differentiated social structure being evident in PM but very little social differentiation occurring in PQ. The observed social structure in PM may have resulted from passive habitat preference rather than genuine social behaviour, as the association pattern disappeared when SSLs moved to sandy beaches within the harbour. Given that these colonies are must-see tourist attractions but may have negative interactions with human activities, we recommend considering the association between SSLs and artificial habitats to design effective management strategies and reduce potential conflicts -- Dra. Gisela Giardino Grupo de Investigacion Biol., Ecología y Conserv. de Mamíferos Marinos Universidad Nacional de Mar del Plata (UNMdP) -IIMyC (CONICET) Deán Funes 3350, (7600) Mar del Plata, Argentina. Tel: +54 223 4752426 (int. 244) Casilla de Correo 1260-Correo Central-MdP https://linktr.ee/becmm