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Running endurance and running direction changes of both bipedal (Dipodomys, Microdipodops) and quadrupedal (Chaetotipus, Heteromys, Liomys, Perognathus) heteromyid rodents were measured to determine if locomotor performance is enhanced in bipedal species. Running endurance was significantly higher in bipedal Dipodomys species (kangaroo rats) compared to quadrupedal species of similar size. Bipedal Microdipodops (kangaroo mouse) had even lower endurance than the quadrupedal species as a group. Both running speed and body mass were found to influence running direction changes. The effects of body mass and speed accounted for more running direction changes in Dipodomys species than the quadrupedal species and the bipedal Microdipodops
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Minou Djawdan (1993) studied this question.
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