Outdoor environment for ducks.....I need some ideas

[sophistacavy]

I already have a piece of land picked out, I just need ideas on how to make a "border" so they don't escape, and so any possible predators can't get them.

The sides are going to go up to a covering that protects them really well from above (its a roof, practically), so I need to make a point of access for me to be able to easily get in there w/ them. Plus, the "human entry/exit way" has to close securely and maybe even lock somehow just in case.

Its a four-sided square enclosure. I was thinking chicken wire, or grids. But w/ the chicken wire, how would I get in? And w/ the grids (I'm talking about the same grids as for C+C cages), their really low, and the ducks could get out, or something else could get in.

Thanks in advance!

~~Katelyn

P.S.: These are domesticated ducks.