WATCH: Giant panda Bao Li celebrates 4th birthday at the National Zoo

Happy birthday Bao Li! The giant panda celebrated turning 4 at the National Zoo in Washington, D.C., on Monday, with a cake made of his favorite foods.

​Happy birthday Bao Li! The giant panda celebrated turning 4 at the National Zoo in Washington, D.C., on Monday, with a cake made of his favorite foods.   Happy birthday Bao Li! The giant panda celebrated turning 4 at the National Zoo in Washington, D.C., on Monday, with a cake made of his favorite foods.