I have been gone this spring about 4 times for about 3 weeks. For the first time birds have been coming down the 5 ft pipe ,thru 2 elbows and past the baffle and stuck in the stove. I dont know how long they were in there. The first was a small black bird and he flew out ok when I opened the door. The second was a dead bluebird. The third and fourth were alive. The third was a bigger grey bird who flew out and found the door opening but was damaged. But he flew away. The fourth was a small blackbird that was in the pipe going thru the wall.I only found it because I took the pipe apart. He freaked out and flew all around the room making soot marks that I spent an hour cleaning. I finally got him in a towel and he flew away but was injured I think. I rigged some screen around the cap for now. I hate to spend 130 bucks on a ready made unit for Duratech 6 inch. But the pipe looks lousy now. That never happened before in 3 years. They pecked some of the door seal rope but it still works. oh well.