Ok, I know that to check if chicken eggs are good, you do the float test (put in a glass of water: sink = good and floats = bad). Does that translate for duck eggs too? Doing an online search only talked about fertilzed eggs and checking to see if they were alive. Proportionally, I think the duck egg is heavier for it's size than a similarly sized chicken egg and thought it might sink either way. We saw her sitting inside a bush beside our house this morning (some distance from the pond and the opposite side of the house from where they spent the winter). So, the egg could be from today or it could be from who knows when and she was just reusing the same spot. This is only the 3rd egg I've found from the ducks and I would like to use it as I had to throw the other 2 away due to not knowing how long they had been under the patio furniture. Thanks!