They are protected from the rain?
We lost 7 chicks our first year, in the Salatin pen. Once they go to roost, they don't move. It rained that night and they had laid down under the 1/4 unprotected area and got wet and died. We bought a tarp and put it over that area if there was threat of rain at night.
We'll, they made it! The tarp is a good idea. I was thinking about using one on the big run as well to help the big birds. Maybe that'll be a project for today.