GPS tracking data of Lesser Black-backed Gulls and Herring Gulls breeding at the southern North Sea coast

Eric W.M. Stienen, Peter Desmet, Bart Aelterman, Wouter Courtens, Simon Feys, Nicolas Vanermen, Hilbran Verstraete, Marc Van de Walle, Klaas Deneudt, Francisco Hernandez, Robin Houthoofdt, Bart Vanhoorne, Willem Bouten, Roland-Jan Buijs, Marwa M. Kavelaars, Wendt Müller, David Herman, Hans Matheve, Alejandro Sotillo, Luc Lens