The first pair of giant pandas — Ling Ling and Hsing Hsing — arrived at the National Zoo in April 1972, as a gift from the Chinese Premier to then-First Lady Pat Nixon.
The Science Behind Animal Snacks smithsonianmag.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from smithsonianmag.com Daily Mail and Mail on Sunday newspapers.