The National Zoo's giant panda Tai Shan is turning 4 years old, making him a teenager in "bear years."

The zoo celebrated his birthday Thursday with a special frozen treat. The large "birthday cake" is made of water, bamboo, shredded beets and beet juice.

Tai Shan's birth made national headlines in 2005, and he's been a popular attraction for zoo visitors ever since. He is the first giant panda born at the National Zoo to survive more than a few weeks. Now he weighs more than 190 pounds.

The mother, Mei Xiang (may-SHONG), and the father, Tian Tian (tee-YEN tee-YEN), are on loan from China. Tai Shan could be moving to China later this year as an agreement for his stay comes to an end.