We recently put our 12 young pullets into a chicken house we had to do a lot of work on to get it livable. It already had a "roost" in there (a 2x4, narrow side facing up). It is approximately 3 1/2 feet off of the ground and my chickens are only about 12 weeks old. Do I need to have one of those chicken ladders/steps (whatever you call them) for them to get up to the roost? Or will they find their own way up there? I have seen them flutter up to another board to sit on, which is probably 1/2 as high as the other roost I am referring to. And do I need one of those ladders/steps outside of their pop-up door to go outside? I currently don't have one, it's about a foot to get down to the ground. If I need one, can I just use a plain board? Thanks!