An old barn in Sister Bay will get some new life moving in thanks to the Door County Land Trust, but who is moving in may surprise you. The DCLT will introduce plans to preserve the Three Springs Barn in Sister Bay so the area's bat population has a reliable place to call home at its Halloween social on Thursday. The barn at the Harold C. Wilson Three Springs Nature Preserve is a maternity roost for the endangered brown bat mothers and their pups. Other farm buildings and old stone fences also provide an essential habitat for area bats.  As a part of the announcement, the DCLT will introduce a grant challenge to help the organization raise funds for the barn. It is all a part of the Halloween social, including Executive Director Emily Wood dressed up as a bat while being interviewed and a chat with Wisconsin DNR Bat Specialist Heather Kaarakka about the critical need to protect bat roosting sites like Three Springs. The free event will occur at the Three Springs Nature Preserve from 2 p.m. to 4 p.m. on Thursday.