Flockandfowl46
Crowing
I'm also thinking too hot...they have wing feathers, turn off that light hun doesn't sound like they need it
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https://www.backyardchickens.com/th...growth-helpful-if-youre-unsure-of-age.884353/ found this link that I hope will work that will help you figure out about how old your chicks actually are... The feed store gave you instructions on how to care for them when they are day olds and they are 1 to 2 weeks...
and having them in coastal CA eliminated the high/cold temps an no real seasons...Now in SE AZ, as we acclimate ourselves, we also have to relearn about the birds temp needs for season changes! Luckily no mounds of snow, just dusting and freezing does occur.
, but yeah, husband is right and we all experience casualties with chickens, whether it be from accident, predator, or genetic problem, it is a part of keeping chickens. There will be losses. But you did your best to save her and can take comfort from that. Going forward, I would be preparing a place for these birds outdoors, they will grow quickly and could go outside by 4 to 6 wks, some in good weather put them out sooner! For you, less than a month away. Look for a shady place to locate your run, if you haven't already, if you have deciduous trees that shed leaves in the fall, that will give them some warmth from the sun in the winter when they need it, shade in spring and summer when they don't. For a chicken house, always find or build one with plenty of ventilation that is accessable and easy to clean... Eventually, when they are completely feathered out, it will just be too hot in the garage for them. Wishing you well and enjoy your feathered friends! Oh, and 
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