This morning I was running and saw it for myself. On my way back, it was in the road. As I was running, it started ... running alongside me. For about 30 seconds, I was running WITH A DUCK.
I was really regretting not bringing along my camera.
I called around, and no one is missing a duck. (My friend thought it was funny that more than one neighbor had ducks. I didn't even register this as being a curiosity. Sure! Lots of room.)
The kids and I went back and fed it some bread. Later it made its way down to the creek, thankfully. I'm pretty sure it's not going to find the kind of aquatic nutrition it needs from whole wheat bread.
I found out it's called a muscovy duck. It doesn't say anything in the description about them being good running partners.