I have seen quite a few postings about this subject but couldn't help myself from in. Our 17 four-week old chicks are leaving the nest tonight. Several reasons dictated this: they outgrew their brooder... we let them in the new run for 20 minutes last evening and then took them back into the house last night.... for the first time, we found 7 of them were injuries by pecking this afternoon so we hurriedly got them outside the weather is really warm today 93° and it is supposed to only get down to 63° tonight after spending the day outside, they look happier, fluffier, and fly a lot.... I think they even grew in just the one day! I will admit that I have been outside with them all day and it was a good thing. I discovered that chicks are very good at getting into things that they shouldn't. Like the girl who decided to fly over the new water bucket before we could get the lid on and fell in and had to be rescued. Or the one that found the screw that we must have dropped during construction. Or like the two different girls that found the green netting from the sod and got all entangled....and let us know right away that they were not happy with that situation and afraid... husband had to rescue them as well. So, yes they will probably be safer in the hen house tonight but that doesn't mean that unless I take a sleeping pill, I won't be up several times checking to make sure they are warm enough, sage enough, and all there. I think these little buggers will find something to get into that we didn't anticipate!