Fig. 1From: WATLAS: high-throughput and real-time tracking of many small birds in the Dutch Wadden SeaMap of the study area with the receiver array and beacons in 2019. The locations of temporary receivers vary between years (Additional File 1: Fig. S1). Land is shown in dark grey, water in blue and mudflat in light grey. The red square in the inset shows the study area within Europe. Rectangle A shows the area of Richel and Griend as shown in Figs. 7, 9. Rectangle B shows the area of Griend as shown in Figs. 4, 6. The coordinate system refers to UTM 31 N. © map data from RijkswaterstaatBack to article page