Due to heavy rain, the water level raised drastically in the last days and arose a few small "ponds" besides our local river. Also the main stream is accordingly extremely wild these days.
Recently I've discovered a really strange behavior of our local swans. They live as a couple in our river normally. They started to collectively move to one particular shore pond a few days ago. They got started with two couples at first. Meanwhile there are swimming 20-30 swans in this small little lake.
- there are also other similar ponds and even bigger ones but they are grouping in one single spot.
- this was discovered in Central Europe
- the swans were Mute Swans
As I understand that they don't want to swim in this crazy river, I don't get why they jam together in such a small spot (it looks a little bit silly, cause they can barely move :D). What is the reason for this behavior?