My six week olds moved into their new home today - nicely sized indoor coop and okay-sized outdoor run - though as they grow I think I will have to expand the run or reduce the number of birds....or, can I let them run the yard more than I think to give them that extra wiggle room? We have a 5-6 foot wooden privacy fence. I've been told they won't fly over that - but might they get up in the lilac tree in the corner and exit the yard that way? Or climb up the childrens' play structure and hop the fence from there? Also, related ....poop in the grass and children playing in the grass...thoughts?