Actually we were thinking of making a small fence in the canal and a ramp in and out and making it so nothing could get in or out accept water and poop, and it would be naturally filtered, so yeah. but i thought that the commercial space for each bird was like 2 square feet and the regular is like 10 feet, so 10x10 is 100square feet and i have a pen 10x38 i think thats 380square feet so i think i got enough space, it does look small in the pics, but its really not if you are just standing or sitting in the pen, and my dad and i are going to go pick up a huge pond for them so its not a kiddie pool anymore and we are going to build a much needed and bigger coop!! So i don't really know, on the rest of the canal there is a 2 foot fence, but for the pen it is 4 foot tall, so i don't know if i will eventually let them free roam. I just don't know if welsh harlequins can fly short distances like chicken, because i was eventually going to get a trio of little welshes and didn't want then flying into the canal, and when it comes time i was going to clip the Muscovys wings, unless the know not to leave or if they do they come back. I don't think that would happen, i would probably clip them though!! and thanks for all the advice, and if you would please give me some more i would GLADLY appreciate it