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xkcd #2893: Sphere Tastiness
(imgs.xkcd.com)
Alt text:
Baseballs do present a challenge to this theory, but I'm convinced we just haven't found the right seasoning.
It's always, it's a solution to the high-fiber low-nutrient herbivorous diet they have. Larger herbivores tend to have longer digestive tracts, rabbits use cecotropes. Designed was just shorthand for it being a regular function of their body and not some fluke of desperation.