Dutch radar reveals mass southward movements of birds in response to frost and snow. The interesting thing, to me, is that birds only seem to move after conditions deteriorate. If they would be able to predict such cold events you'd expect them to start moving sooner, right?
Spectaculaire vorsttrek van wolken vogels naar het ZW op vogelradar. Hier Woensdrecht, maar in heel west en midden Brabant te zien. Nog niet in noord Nederland
#robinradar,
@Sovon @trektellen