Baby polar bears bond with Mama bear

Twin polar bear cubs Gregor and Aleut play in their enclosure at the zoo in Nuremberg, Germany, March 23, 2011. The cubs were born on December 2, 2010. [Photo/Agencies]

Twin polar bear cubs Gregor and Aleut are pictured with their mother Vera in their enclosure at the zoo in Nuremberg, Germany, March 23, 2011. [Photo/Agencies]