Was cleaning last night and found some little black/brown bits on my computer stand that looked like mini hamster poohs (I have a hamster). Anyway, asked partner and he just looking around house now. All along back wall in living room there this little black bits (look like droppings) - back wall is where computer is. Cant find any mice holes or any mice, but am scared!!!!!!!!!!! Any ideas what we can do to find if we have them? The black bits I found along back wall are only place we have found them - but they must br droppings. HELP!