When the British army was working with Arab fighters during world war one, the Arabs loaded far more supplies onto a camel than the British did. The difference was, the British were loading them at a rate (set down in their Staff manuals) that the camels could sustain indefinitely. The Arabs were intentionally overloading them so that they would last as long as the supplies they were carrying, then they'd eat the camels.
Not a strategy most people would use with human pack animals.
Andrew
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