A short history of panda fever worldwide

Canadian Prime Minister Justin Trudeau says hello to Jia Panpan and Jia Yueyue on March 7, 2016, when the cubs officially got their names. (From Justin Trudeau (@JustinTrudeau) | Twitter)

The cooperative breeding program replaced the renting project in 1994. Under the new agreement, a receiving country needs to pay China $10 million for a 10-year loan of giant pandas. Two giant pandas were sent to Japan as scientific research envoys for the first time in 1994.

During the past 22 years, the effect of the project has been well received as this kind of cooperation proved to be more beneficial for the comprehensive research on giant pandas.

Mei Lun, Mei Huan and Bao Bao are all part of the 10-year China-US cooperative breeding project which started in 2000.

According to the cooperative breeding agreement between China and the US, all cubs born in the US should move to China when they are 4 years old. Now four US zoos - in Washington, Atlanta, Memphis and San Diego - now house giant pandas.

By now, China has built long-term cooperative projects with 14 countries with a total of 48 giant pandas living abroad.

Giant pandas' decades of diplomatic service has won them worldwide adoration and made them the most successful ambassadors of China. Nearly 60 years later, the fever for these Chinese cuties has not cooled.

Though the young pandas' departures may be heart-breaking for Americans at present, one thing we can be sure of is that the giant pandas will keep bringing joy and happiness to people across the world.

Panda cubs Jia Yueyue and Jia Panpan play with their mother Er Shun at the decorated birthday party room at the Toronto Zoo in Toronto, Canada, Oct 13, 2016. [Photo/Xinhua]

Giant panda Mei Xiang and her son Bei Bei play together during Bei Bei's one-year birthday at the Smithsonian's National Zoo in Washington on Aug 20, 2016. [Photo/Xinhua]

Giant panda Bei Bei his one-year birthday at the Smithsonian's National Zoo in Washington on Aug 20, 2016. [Photo/Xinhua]