Ok, she gave me a laugh for the day.
the prehistoric peoples would meticulously use all parts of animals they hunted, out of respect for them and their environment.
Or it might have been to impress Una the hot babe that lives two caves down.
Or it might have been to impress Una the hot babe that lives two caves down.
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Or, because the critters were difficult to track over long distances and dangerous to close with and kill once tracked down, so use every bit possible to put off having to do it again for as long as possible.