Ive been reading all the posts about humidity, and now i dont know what to do. my chicks and ducks are on day 18. i dont have any way to measure humidity. when i spoke to 'farmer dick' at the feed store, he said that he used to hatch tons of all sorts of birds together in a large bator. didnt measure humidity. his advice to me was to open the vents, mist them if i feel i have to, have water in the bottom, and dont let condensation form in the bator. our spring weather is perfect for a hatch. im also watching thier air sack to make sure its getting bigger, but not to much. all 24 of them are big, moving around and seem good at the moment. any thoughts?