Find out we’re there coming in it’s eather a attic or fireplace they need very small hole to climb through
Kathy....Call an exterminator!
Our 100 year old house had bats in the attic when we bought it... I hired an exterminator to get them out and clean up the guano, (bat poop) It can carry a virus and make you quite sick. They eradicated, cleaned and sanitized the entire space. Here is the post showing the attic Before & After renovation!
Find out where they are coming in, to do this if you suspect the attic:
Place a lamp up there and turn it on, now go outside after dark and see where the light comes through, that is the point of entry that needs to be blocked off.