A hundred of individuals flew past the reserve following the coastline, certainly on its migration route to the north. Some time later only 70 individuals cambe back. Some reason, perhaps bad weather conditions, caused them to stop. Since they could not find a place big enough to be all together, they scattered in groups. This group reached the chimneys of the electricity plant, circled them a couple of times and disappeared from sight. They possibly landed in the surroundings. Half an hour later a small group of 30 individuals was seen flying north and then south again.