Zoo Atlanta’s last four giant pandas will be moved to China next month, as its 25-year agreement with the country comes to an end. The zoo's president and CEO says

All four giant pandas that have called Zoo Atlanta home landed back in China on Saturday. It's been 23 years since the parents came to Georgia.

It was a bittersweet farewell at Zoo Atlanta on Saturday morning when giant pandas Lun Lun, Yang Yang, Ya Lun, and Xi Lun officially started their journey back to China.

ATLANTA — Zoo Atlanta bid farewell to four giant pandas who left on a FedEx plane to China Saturday morning. The pandas’ departure marks the end of a 25-year deal with the Chinese Association of Zoological Gardens and Chengdu Research Base of Giant Panda Breeding, where the pandas will begin the next chapter of their lives.

ATLANTA — After 25 years, the time has come to say goodbye to Zoo Atlanta’s panda family. Lun Lun, Yang Yang, Ya Lun and Xi Lun officially left for the Chengdu Research Base of Giant Panda Breeding on Saturday morning. Three Zoo Atlanta team members are making the journey with them to help keep them comfortable on the flight.

Documents from recent deals that brought four new pandas to the United States reveal just how intricate and highly secretive the exchanges with China can be, reported the New York Times. The documents,

FRONT ROYAL, Va. - On a wet Thursday morning in rural Virginia, a buzzing noise emerges from a patch of tall, green trees. A group of five workers, dressed in thick pants and boots and armed with chain saws and loppers,