During this process, some will pee,some drop their feces, but once in a while we usually come across some droppings of blood by this matured rats...we were always disturbed even as we clean them off.
One day our director who happens to be a professor came into the factory before we resume on duty that day, and when we make a comment on that, which he actually witnessed, he told us that all female mammals are likely to undergo the menstruation processes.
But many are yet to be convinced in this issue. you can make your research!
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