The Mute Swan, Labedz niemy (Cygnus olor).

The images in this gallery show a flock of wild swans and other water birds trying to survive severe winter time.
They have found an ice free water on Vistula river near Kepa Tarchominska (Tarchomin Hurst) in the outskirts of the Warsaw. There is a place where warm water from sewage treatment plant comes into river.