Nuts Over Knut

Polar bear cub Knut, born on Dec. 5, 2006, at the Berlin Zoo, shows his teeth on March 2, 2007. The cub, whose mother Tosca rejected him, has been hand-reared by and living with his caretaker.

Polar bear cub Knut, born on Dec. 5, 2006, at the Berlin Zoo, plays on March 2, 2007. The cub, whose mother Tosca rejected him, has been hand-reared by and living with his caretaker.

Polar bear cub Knut playing in a zoo facility, Feb. 27, 2007. Knut, the first polar bear to be born in the animal park in over 30 years, spent his first 44 days in an incubator after being rejected by his mother.

Stuffed polar bear toys are on sale in a toy store on March 21, 2007, in Frankfurt, Germany. Retailers and manufacturers of stuffed toy polar bears are responding to the excitement about the polar bear cub Knut at the Berlin Zoo.

Keeper Thomas Doerflein gets a kiss from Knut the polar bear cub, March 23, 2007.

Knut the polar bear cub makes his first public appearance, March 23, 2007, in the Berlin Zoo.

Knut, the polar bear cub, makes his first public appearance in the Berlin Zoo Friday, March 23, 2007. Television crews and photographers jockeyed with hundreds of excited children at Berlin's Zoo on Friday, all eager for a first glimpse of the fuzzy white polar bear cub who has captured hearts across the globe.

Knut the polar bear cub makes his first public appearance, March 23, 2007, in the Berlin Zoo.

Knut helps himself to a package of snacks from keeper Thomas Doerflein's pocket, March 23, 2007.

Photographers struggle to get a view of Knut, a 3-month-old polar bear cub, during his first outing at Berlin's Zoologischer Garten zoo March 23, 2007.

German Environment Minister Sigmar Gabriel, right, chats with zoo keeper Thomas Doerflein as Knut the baby polar bear walks about on Knut's first walk under the cheering gaze of the public, at the Berlin Zoo March 23, 2007, in Berlin, Germany.

Knut, a three-month-old polar bear cub, plays with his keeper Thomas Doerflein during his first outing at Berlin's Zoologischer Garten zoo March 23, 2007.

Visitors and press gaze at Knut the three-month old baby polar bear on Knut's first walk in view of the public, at the Berlin Zoo March 23, 2007, in Berlin, Germany.

Knut, the polar bear cub, plays with a blanket during his first public appearance in the Berlin Zoo on Friday, March 23, 2007.

Knut, the polar bear cub, makes his first public appearance at the Zoo of Berlin, Germany, Friday, March 23, 2007.

Knut the polar bear cub rolls in the sand during his first public appearance in the Berlin Zoo on Friday, March 23, 2007.

Knut the polar bear cub is held upside while playing with zookeeper Thomas Doerflein, during his first public appearance at the Berlin Zoo, March 23, 2007.

Knut the 3-month old baby polar bear licks his minder, zoo keeper Thomas Doerflein, on Knut's first walk under the cheering gaze of the public at the Berlin Zoo March 23, 2007 in Berlin, Germany. Knut was rejected by his mother and animal activists have said Knut should be put down, though zoo officials have vowed to nurse him to maturity with human help.

Knut, a 3-month-old baby polar bear, plays with zoo keeper Thomas Doerflein in the sand under the cheering gaze of the public at the Berlin Zoo on March 27, 2007.