Giovanna, the new mate of world-famous polar bear Knut, covers her head as Knut goes for a swim in their enclosure at Berlin Zoo.
From Wikipedia: Knut, born 5 December 2006, is a polar bear who was born in captivity at the Zoologischer Garten Berlin. Rejected by his mother at birth, he was subsequently raised by zookeepers. He was the first polar bear cub to survive past infancy at the Berlin Zoo in more than thirty years. At one time the subject of international controversy, he became a popular tourist attraction.
Knut during his debut at the Berlin Zoo on 23 March 2007.