In 1972, Richard Nixon's surprising visit to China and an unlikely exchange of zoo animals helped thaw relations between China and the United States, and set off "panda-monium" in Washington.
In April 1972, Washington's first-ever pair of pandas, Ling-Ling and Hsing-Hsing, arrived. They created what First Lady Pat Nixon couldn't resist describing as "Panda-monium" in the nation's capital.