The "too tall for them to fly out" may be a little optimistic when they get to 4 weeks or so. those little suckers can get real AIR. I kept my young chicks (3-4 weeks to 3 months) in a hoop coop with a 2'+ roost, and they got up to it with absolutely no problem and air to spare.
Edited to add picture proof -- these chicks are 3 weeks old. The top of the roost is about 27 inches. The white chick is an EE who turned out pure white (Lily) and the darker one is a GLW (Vic) who died last fall for no apparent reason.

Edited to add picture proof -- these chicks are 3 weeks old. The top of the roost is about 27 inches. The white chick is an EE who turned out pure white (Lily) and the darker one is a GLW (Vic) who died last fall for no apparent reason.
After spending a week looking for a used pack and play at various thrift stores, my new neighbors gave me theirs that they came across while they were moving. I moved my eight silkie babies in there Saturday. I think they are loving it. They can now see out the sides, they have more room, and the sides are too tall for them to fly out. Now I need to find another one for the other bantams I am growing out.
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