Hippos
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Now compare that to factory farms and their manure run off.
Roughly 2.57632e9 lbs per day according to this report.
U.S. factory farms are raising more animals than ever before. Together, the 1.7 billion confined animals produce an appalling 941 billion pounds of manure each year — double the weight in human sewage produced by the entire U.S. population.
And much worse managed I bet