Thatās a wonderful set up, large and roomy not to right. Where is their source of heat and water and food? I assume itās on the other side we canāt see but Iād like to see what you use as a heat lamp.View attachment 2358916This is the inside of the brooder, they shouldnāt have overheated we have had a early cool snap. Iām thinking it was probably coccidia but itās poop wasnāt bloody. When our dog got it, it was terrible that is the most worst disease your pets could get. We watched our sweet baby girl just wither away and no matter how much fluids and food we had to force her to eat she just didnāt get better... so I am familiar and the chick had all the classic symptoms except the bloody poop. I just cleaned their water container really good.
It was probably to cold and this caused it to get sick and die. Please show us their heat source since you said it is chilly and it appears to be an outdoor brooder. Indoor brooders are a far safer option for the Coker months