My four ducks and drake managed to let themselves out of their shed (they can open the pop hole and squeeze out) but they also magicked their way out of a run with four foot high solid wooden fence panels with another 3 feet of netting above it, and done a bunk. So sod them, they were skittish anyway, I've put half a dozen eggs in the incubator. Now I need to remember when to candle them - is it 10 days?