Interesting sidenote:

In addition the cannibalism practiced by the Karankawa, they engaged in another bizarre dietary habit: When food supplies were low, they picked out undigested bits of food from their fecal matter, like whole seeds, and ate them again. A kind of Second Harvest, if you will.

I learned this in seventh grade history; at the time, the teacher told us this was the only thing we would remember from the class. He was, in fact, correct about the minds of thirteen-year-olds.

Please let me know if I am factually inaccurate.