Im getting 4 mallards 1 boy 3 girls and also a pekin in about 2 weeks.Im very exited but need to get started on there run.Its gonna go into the woods,into part of my swamp and also its gonna have 2 tiny ponds in it.The deth is about a foot and the like 7by4.I plan on running wire fencing around it.Since most of them are mallards they still have loads of natural instinct left so they will probibly hide in the wooded part incase a hawk comes by which is rare.How high should the fencing be?I think I might cut there flight feathers but still how high can they fly?