Sarah, an 11-year-old cheetah at the Cincinnati Zoo, set a new world speed record this summer during a shoot for National Geographic magazine. She first earned the title of world's fastest land mammal in 2009 when she covered 100 meters in 6.13 seconds, breaking the previous mark of 6.19 seconds set by a male South African cheetah named Nyana in 2001. On June 20, 2012, Sarah shattered all 100-meter times when she posted 5.95 seconds. By comparison, Sarah's 100-meter run was nearly four seconds faster than the world's fastest man, Usain Bolt of Jamaica, whose fastest time for the same distance is 9.58 seconds. Sarah's top speed was clocked at 61 mph.