When ever you put any animals into a fence pen some will wonder into the corner and never come out. It's not that they don't want to come out they can't come out unless you pull them out with leads or break the corner. If you bread 2 animals in the corner they will just sit in there respective corners with hearts but not go to each other to make a baby. I have seen that there are some other issues of this posted that say it is resolved but I am posting this because the issue is NOT RESOLVED.