Flock of birds

There is now snow in my city any more; all was melt after the rain we had had for a few days. Only the mountains, which surround the city, have still been covered with the snow. But now, it is really freezing outside. It was 6°C bellow the zero this morning. It is warmer now. There are -5, 5° C now. :-))
A huge flock of birds in the air attracted my attention yesterday late afternoon. My camera couldn’t capture all the flock. That sight was interesting to me and I wondered if there had any sign in it.