No weasels. I haven't lost a bird to a predator in a very long time. My pens are 150' x 60', but the birds do get let out most every day into the pasture. Just go with what ever works for you. Some of the shade tables were made from a unfinished coop that was given to us and we took the coop apart and used the wood to frame the tables and the tin from the roof as covers for the tables. Originally the first shade tables we made were 2" x 4" wood for the frames that we put primed and painted plywood over for the tops, but they still got some rot, so now all of the tables have metal tops. Much better and I go out at least once a week and clean the poop and dirt off of them because the birds do get on them and carry the dirt up and they do poop on them too, so I clean them off. Not really a hard job. Good luck and have fun.