I am one to believe that the eggs are on plant life that is wrapped up around the water fouls feet and is moved from pond to pond. The eggs are not stuck to the birds feet but the plants they have moved. Some ducks when fighting (like seagulls do at the beach over a fry) will take off with a mouth full to land in another pond to eat it or even fight in the air and drop it.
It may take time but persistence pays off more often then not.
Cheers Don.
You know come to think of it I have a lake nearby that doesn't have sand or gravel for spawning beds for bluegills. The bluegills nest right on top of the submerged vegetation. Apparently they prefer the vegetation over the marl bottom.
