It sounds like your chicks are in the house. If so, you have to be aware of all the airborne toxic thing. Birds are highly sensitive to fumes. No candles, no air fresheners, etc. Most importantly, no Teflon! I lost two chicks within minutes of each other, so I rushed the others outside while I aired out the house and tried to determine the cause. Turns out, the stove liner had Teflon in it and I had been boiling a pot of water which released the toxic gas into the air. Check all your cooking containers and any stove or oven liners. Teflon is also listed as PTFE, FEP, PFA, and ETFE.