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Animal Ark co-founder Diana Hiibel releases Jamar on the high-speed cheetah exercise course Thursday, June 30, 2011 north of Reno, Nev. Weekly, the cheetahs chase a low string line through the course, simulating prey, and then handlers feed them. This has proven to improve the digestive health of cheetahs living in captivity. .Photo by Cathleen Allison