Reappraisal of energetics of locomotion shows identical cost in bipeds and quadrupeds including ostrich and horse.
D000818:Animals; D000836:Animals, Zoo / Q000502:physiology; D001835:Body Weight; D004734:Energy Metabolism; D006736:Horses / Q000502:physiology; D006801:Humans; D008124:Locomotion; D010101:Oxygen Consumption