Agreed about duck eggs being dirtier than chickens eggs and the ducks eggs do have a thicker shell. My ducks lay anywhere from behind a board, along the fence, by a flower pot, or in one of the shelter (my ducks free range). My pekin started laying at 4 - 4 1/2 months. My muscovy ducks aren't laying but now most likely won't until spring, they are 6 months.