I just thought I would share: My broody hen went on "Lock-Down" today. The last time she came off her nest was yesterday late afternoon to eat, drink and dust bath. It was day 18. Today I opened up her crate like I did all the other 18 days before, but she did not come out anymore. Isn't it amazing, that a broody hen knows exactly when her eggs are due to hatch? Is it instinct? So everything being said about "Lock-Downs" with incubators has been proofed correct. I had many broody hens in the past, but never really paid attention if they came off the nest or not. Interesting. Looking forward to day 21, which would be Saturday - however I have experienced it many times, too, that eggs under a broody hen hatched on day 20.