Herding animals wasn't the only challenge; zoo staff also needed to ensure the shelter of all 10,000 visitors. Throughout the zoo, there are areas considered safe severe weather zones.

By Lee Powell Nov. 17 at 6:30 a.m. At the Smithsonian’s National Zoo and Conservation Biology Institute, weigh-ins are a way of life. Animals are ... there are 7,500 to 10,000 cheetahs in ...