Recommendation: Alexander the Great and the Logistics of the Macedonian Army, by Donald W. Engels.
A droplet of the final analysis of this book: All animals that are used to carry food, equipment etc. have the same ratio of food required to weight carried to distance travelled. 80 pounds for humans for extended distance, eating 3 pounds of food. 250 pounds for "average pack animal," eating about 9 pounds
Humans however end up being the best possible pack animals for one reason: we have predator physiques while all others have prey biology. Any pack critter can be pushed over the edge of normal endurance, but when a horse or ox gets a sprain you might as well eat it. When people get a sprain they can rest for a while and recover.
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