Rex, cuckoo maran mix, turned 30 weeks old today and since yesterday, he’s had this kind of gurgling when he crowed, sometimes has a rattling when he breathes ( doesn’t happen all the time ), and seems to breathing a little heavier than usual. I separated him from the rest of the flock and when I was catching him, he stressed himself out and this clear liquid came out of his mouth and the rattling when he breathed was worse/flared up. He seems to be eating and drinking fine, all things considered, and was calling the hens over when i gave him food even though they couldn’t get to him. His clucking & chittering sounded normal, it’s just been his breathing and crowing. other than that, his eyes are clear and not puffy, his nostrils don’t have any discharge, his appetite is fine, his poop looked normal, and none of the other chickens are displaying any symptoms ( yet ) that I’ve noticed.