I'm planning on getting ducks. I know all about the house/coop, and the pool/pond. Now for their yard, i.e. their fenced-in outside area. What should I put there, besides the pool and the house? Are the ducks like chickens and want a lot of bushes? Or do ducks prefer a large open area? If not straight-up bushes, should I put a few little shelters here and there, for shade and sense of security? I gather ducks have rather sensitive feet; does this mean I should avoid boulders and stuff in the yard? Should the area be grass-covered? I've read that ducks don't eat much grass. Enough of the questions - you get the idea. Thanks in advance!