It's another example of just how cold this winter has been in parts of the northern hemisphere.
Recently, dozens of swans had to be freed from a lake in western Ukraine after the water turned to ice.
The region's lakes don't normally freeze in the winter, thanks to a series of warm springs nearby. But last year's floods plugged some of those springs, and a recent string of cold temperatures resulted in a thick layer of ice.
In the winter, swans need to be in open water so they can swim to keep warm and find food.
Local emergency workers and residents came to the rescue by feeding the birds and breaking up the ice. Fire engines also pumped warm water into the lake to prevent it from freezing again.