First documented movement of wild killer whales (Orcinus orca) between Iceland and Norway.

This article focuses on the first confirmed photographic evidence of round-trip and one-way movements of four wild killer whales (Orcinus orca) between Iceland and Norway from 2018 to 2024. Using photo-identification methods supported by citizen science and research cruises, individual whales were matched across extensive photo catalogs from both countries, revealing minimum travel distances of over 3,000 km in some cases. These findings suggest greater spatial overlap and connectivity between North Atlantic killer whale populations than previously recognized, challenging assumptions of isolated populations and highlighting the importance of international collaboration and data sharing for understanding their ecology and conservation status.