Dear MARMAM community, We are pleased to announce the following publication in Marine Mammal Science: Marie-Thérèse Mrusczok, Emma Luck, Ted Cheeseman, Jamie Coleman, Javier Cotín, Andrew Peacock, Robert A. Stefansson, and Menja von Schmalensee. *First documented movement of wild killer whales (Orcinus orca) between Iceland and Norway*. Marine Mammal Science. Early View: https://doi.org/10.1111/mms.13187 Abstract: In this publication, the first photographic match, round-trip, and one-way movement of four wild killer whales between Iceland and Norway are described – the only other killer whale previously documented to have swum from Iceland to Norway being the male killer whale Keiko, who was tracked using satellite telemetry. Sightings and observations of the four individuals between 2018 and 2024 were obtained by a combination of citizen science and dedicated research cruises along the Icelandic and Norwegian shoreline. In Iceland, data collection was part of a long-term running photo-identification study (2014-2024), and images taken in Norwegian waters were uploaded to the citizen science web platform Happywhale, subsequently resulting in the photo-ID matches. Ongoing efforts for data collection, to determine the regularity of long-distance and round-trip movements through international collaboration, will aid in our understanding of killer whale populations and their conservation status in the North Atlantic. Find the publication at: https://doi.org/10.1111/mms.13187 Find more information on our research efforts at: www.orcaguardians.org www.nsv.is For further inquiries please contact: info@orcaguardians.org All the best, Marie Mrusczok