Look, I found a goodie!   ------- And why does he really do it? Here's the Wiki answer:  Young elephants, pandas, koalas, and hippos eat the feces of their mother to obtain the bacteria required to properly digest vegetation found on the savanna and in the jungle. When they are born, their intestines do not contain these bacteria (they are completely sterile). Without them, they would be unable to obtain any nutritional value from plants.  Wiki --> Coprophagia --> http://en.wikipedia.org/wiki/Coprophagia

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