Ok, today I let the chickens out of the coop. I decided to open the door to the run to see what they'd do(snow was everywhere). So, one of my golden sebright cockerels decided to take flight and flew straight out of the run and did a sharp turn to the left. I went over to him to make sure he was ok. When I picked him up he was breathing pretty heavily and I could here some weezing when he exhaled. Is this something that I should keep an eye on? I opened their windows this morning to get some fresh air flowing through the coop (the windows are just hardware cloth covered in plexiglass covers). He is about 18 weeks old. Thanks for any and all help!