SAN DIEGO -- The San Diego Zoo is saying goodbye to two big, furry superstars.
A male, Gao Gao, returned to China last October.
For more than two decades the zoo was part of an international effort to save the panda species, which at one point was on the verge of extinction and is now listed as vulnerable.
Several cubs were born at the zoo, helping to repopulate the species.
There are now nearly 2,000 pandas in China.