The Southern California erythracarid mite species, Paratarsotomus macropalpis, which is smaller than sesame seed, can run up to 322 body lengths per second, according to a study led by biologist Samuel Rubin of Pitzer College, Claremont. The previous record-holder, the Australian tiger beetle, can run at 171 body lengths per second. By comparison, a cheetah running at 100 km per hour attains only 16 body lengths per second. Paratarsotomus macropalpis....