Instructions are given in Deuteronomy 23:13 for covering up feces when defecating. Why is that?
Because God walks in the midst of your camp
And thou shalt have a paddle upon thy weapon; and it shall be, when thou wilt ease thyself abroad, thou shalt dig therewith,
and shalt turn back and cover that which cometh from thee:
For the LORD thy God walketh in the midst of thy camp.
Deuteronomy 23:13