To prevent mice from getting in your house or to make them leave your house try this: take cotton balls and dip them in peppermint esscentual oil, then put them in the places where you find them. I place them in my closets, behind my couch, in some of my cabinets. The smell will be strong, but I tried this last winter, and all signs of them disappeared. It might be too strong to place near the chickens though, but it doesn't seem to affect my housepets.
I went and bought the oil at a health food store, and funny thing, the store itself smelled like peppermint - they were using it to keep the mice away too.
I went and bought the oil at a health food store, and funny thing, the store itself smelled like peppermint - they were using it to keep the mice away too.