Translated from Natuurmonumenten in the Netherlands:
Last Monday at around 11:01 a.m., a spectacular arrival of migratory birds from Scandinavia began in the Zwanenwater.
In the Zwanenwater, a dune area near Callantsoog, migratory birds are caught every year for scientific research. This year began quietly, in the early morning there were few birds.
After 11 hours, however, thousands of birds came from the sea. Song thrushes, robins, siskins, bramblings [see also here and here] and many other species landed in the rain in the dunes. There, in total, on Monday 77 birds and on Tuesday more than 100 birds were provided with a ring of the Arnhem bird migration station.
These birds generally depart in the evening from the southern tip of Norway to the North Sea to fly to southern Europe. Today, however, the rain forced them to land earlier. Their ultimate goal is the Mediterranean, where they will remain throughout the winter.