Who first thought of dung as food? Was it the dung beetle, or the pig? I suppose if insects evolved before mammals, the palm goes to the beetle. As everyone knows, dung beetles work in pairs to make a ball from the nearest dung pile, where they roll it into their burrow, lay their eggs in it, and leave it as a tasty food supply for their progeny. Pigs will eat the excrement of any species, but rabbits practice a special type of coprophagia; they eat their own soft fresh cecal pellets for redigestion, since they lack the four-chambered stomach of bovines, which recycle its contents to the mouth more discreetly.
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