I just built a chicken coop for my three new chickens (4 months-old) and i would like to fence in a large area that spans across a creek (averages 3 ft wide and 1.5 ft deep). The best area for them to forage is on the other side of the creek. Is that safe for the chickens? Will they drown? I have a small bridge they can cross over if they figure it out. Any advice would be greatly appreciated.