A few days ago, the swans were back, happily swimming on the lake with their new baby.
Then yesterday, they were gone, and the lake had frozen about 2/3 of the way across.
When I went to check the ice on the lake today, it was totally frozen from end to end, and to my horror, it looked like the swans were frozen into the ice.
So I walked through the woods to the end of the lake to get a better view.
They are all fine - just sitting in the sun on the ice, making really interesting sounds.