STRAITS will deploy infrastructure to monitor animal movements using acoustic telemetry at four key locations in Europe: 1) the Danish Straits, 2) the North Channel, 3) the Strait of Gibraltar, and 4) the Strait of Bosphorus and Dardanelles. STRAITS will leverage ongoing acoustic telemetry tracking projects, expand efforts to connect tracking initiatives from across Europe, develop data management plans and networking to promote synergy and deliver data to national and international governing bodies. Coordinating aquatic animal tracking and environmental observation efforts at a scale that will be usable to make progress on international marine management and planning, is a major step towards an operational European Tracking Network (ETN) that contributes to major European biodiversity initiatives, conservation, and policy.