Its pretty simple really, it all comes down to efficiency of the animals digestive system. The more efficient the animals ability to extract moisture out of its food, the more pellet like the excrement become. Deer and rabbits are among the most efficient at extracting water from their food, with horses pulling in a close second. Cow excrement though retain a high level of its moisture and can often be found in big wet piles of shit.
"Lighthouses are more useful than churches."- Ben Franklin
"Religious bondage shackles and debilitates the mind and unfits it for every noble enterprise."- James Madison
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