Giant panda Yuanyuan looks at her birthday cake as she celebrates her 5-year-old birthday in Taipei Zoo in Taipei, Taiwan, August 30, 2009. This is Yuanyuan's first birthday since she and Tuantuan arrived in Taiwan as a gesture of goodwill from Chinese mainland.

Giant panda Yuanyuan eats her birthday cake as she celebrates her 5-year-old  birthday in Taipei Zoo in Taipei, Taiwan, August 30, 2009. This is Yuanyuan's first birthday since she and Tuantuan arrived in Taiwan as a gesture of goodwill from Chinese mainland.

Giant panda Yuanyuan eats her birthday cake as she celebrates her 5-year-old birthday in Taipei Zoo in Taipei, Taiwan, August 30, 2009. This is Yuanyuan's first birthday since she and Tuantuan arrived in Taiwan as a gesture of goodwill from Chinese mainland.

Giant pandas Tuantuan (R) and Yuanyuan eat a birthday cake as Yuanyuan celebrates Yuanyuan's 5-year-old birthday in Taipei Zoo in Taipei, Taiwan, August 30, 2009. This is Yuanyuan's first birthday since she and Tuantuan arrived in Taiwan as a gesture of goodwill from Chinese mainland.

Visitors queue up to take a picture of giant pandas Tuantuan and Yuanyuan as Yuanyuan celebrates her 5-year-old birthday in Taipei Zoo in Taipei, Taiwan, August 30, 2009. This is Yuanyuan's first birthday since she and Tuantuan arrived in Taiwan as a gesture of goodwill from Chinese mainland.