What animal is in my ceiling/walls?

For about a month i ve been hearing soft bangs, scratches and running around in my roof and walls. It sounds like just one or maybe two small creatures (it can run fast too). There has been no vocal squeaking noises or anything. It is almost silent during the day and VERY active late at night (I m thinking its... show more For about a month i ve been hearing soft bangs, scratches and running around in my roof and walls. It sounds like just one or maybe two small creatures (it can run fast too). There has been no vocal squeaking noises or anything. It is almost silent during the day and VERY active late at night (I m thinking its nocturnal). Any Idea of what animal it could be?
Update: The running it does sounds like a really fast pitter patter sound and the scratching its pretty loud
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