I am thinking of getting some chickens. Live ones, for eggs. I have seen a kind of self-contained ark and run, about 12' long 3' wide and the ark is 3' square and same high. So, are they easy to keep? We live on an executive development (honest, it said so in the brochure!!) and have a garden about 15m square. Is this space big enough? Would I have to let the flea ridden little buggers out of their run? Any thoughts and experience greatly appreciated.