WASHINGTON - JULY 09:  Giant panda Tai Shan checks out his birthday cake at the National Zoo July 9, 2009 in Washington, DC. The zoo held an event to celebrate the panda�s fourth birthday with a frozen cake made from water, bamboo, shredded beets and beet juice. Getty Images logo Getty Images 4 months ago

WASHINGTON - JULY 09: Giant panda Tai Shan checks out his birthday cake at the National Zoo July 9, 2009 in Washington, DC. The zoo held an event to celebrate the panda�s fourth birthday with a frozen cake made from water, bamboo, shredded beets and beet juice.