Polar bear cub Knut is reflected in the water during the bear's first presentation in Berlin zoo, March 23, 2007. Knut, born on December 5, 2006, had to be hand fed every four hours by Berlin zoo employee Thomas Doerflein after its mother Tosca refused the baby. REUTERS/Tobias Schwarz (GERMANY) EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS