I have a pond a fair distance down a field from my house and in this weather have only gone down there a few times this spring. On two occasions, though, I flushed a pair of mallards. Didn’t see a nest, though. Last week I went down there and lo and behold there was an egg on my dock, a big duck-sized egg. Mystifying. I went back down yesterday and oddly it was still there, not eaten by anything. Anybody have any ideas? Why it was “laid” there and why it’s still there?