Rushed outside then they all started falling over. 20 minutes later most of them were back in their pen where it's cooler.
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you are lucky to have green grass. mine stay in their coop almost all day long.
btw, I have 12-14 silkie chicks, black, blue, partridge and 1 that looks dark brown/sort of partridge. hope they live as my roo got sick and died. not sure if he was healthy before they hatched. I now have 1 red roo. I might keep all/most of chicks.