Help! My son found 2 eggs on a waters edge about 16 days ago. No nest no fowl insight. He brought them home so we thought, why not let's try. We have an incubator, adjusted the temperature for ducks, but no way to adjust humidity. We just did a candle light check at 16 days and I think one has stopped developing (possible ring of death unsure) and the other still has movement. Both eggs have developed hairline cracks. Air sacs seems to be intact butbreally I am at a loss as to what we are doing. What are the chances the one at least will still develop?