Chickenman MAN
Songster
Yeah I agree... cyanide seems very unlikely... frostbite is also weird. However, we must see that his health has improved since being in warmer conditions. BUT I would agree that he should be kept seperate for a bitPoisoning is highly unlikely; and unless temps have consistently been below freezing then that’s not frostbite.
I disagree about keeping the heat lamp on him. That’s too much of a temp extreme variation as the bird was not suffering from being too cold or frostbite (37 is way too warm for that, unless the chicken is featherless). I would just separate her and keep an eye - but heat lamp is probably too much.