Question on the mallards.. I had 2 mallards show up end of December, and about 3 weeks ago found them nesting on the ground under some bushes with about 14 eggs. Last week we noticed broken egg shells, and check and all the eggs were gone. Heron? Grackels? Raccoon? Not sure what.

So I wanted to see if I could build them a nest structure. I found some people online saying they would re-nest. Found this:
http://www.deltawaterfowl.org/ddp/henhouses/build.php

Built one quickly. Liner pond so I couldn't put it on their mount, so I put it on 2 saw horses I had in the water to avoid predators.

Here's a pic of them and the fish feeding next to it. Odds they'll use it??