Final answer:
Large bodied species will cover distances at a lower weight-specific cost than small bodied species due to their relatively higher Basal Metabolic Rates (BMR) per body weight.
Step-by-step explanation:
In comparing animals that share a single primary mode of locomotion, large bodied species will cover distances at a lower weight-specific cost than small bodied species. This is because larger animals have relatively higher Basal Metabolic Rates (BMR) per body weight due to their greater surface area. BMR is the amount of energy required to maintain basic bodily functions. Smaller animals, on the other hand, require more energy to maintain their size, leading to a higher weight-specific cost.