I'm brand new to chickens, and I've managed to keep my flock alive for almost 4 months. We're in Florida, it's hot, wet, and everything is trying to kill everything. My leghorn died today and I'm not sure wahy. Might have been a spoiled crop. She was lethargic, not eating, weak, squishy crop, and she put her head back, garbled, and a Yellowy liquid came out her face when she passed. She wasn't panting, I didn't notice anyabnormal poo, and it allhappened in about 24 hours. The rest of the girls look and seem like their normal selves, but I'm worriedly. One is constantly panting even at night, and I have no idea what to do to help it. I have an arsenal of chicken emergency supplies, but still not sure when or How to use them. Besides the ungodly heat, here, what could be causing the panting? And what else might have killed my chicken so that I can protect the rest of the flock? I just treated them with ivermectin as a preventative measure. They have some electrolyte, and probiotics, and nutridench. Help! Please!