This morning, while the other chickens were out happily pecking about he yars, my golden polish hen was sitting on a nest. I figured she was laying an egg. So about 2 hours later, I come back to collect the egg and she is still on the nest. She appears to be turning the egg. But strangest of all, she was making a low, quiet, rapid-fire clucking when breathing out. Now I've heard about hens lowly clucking while brooding, but a polish? Also, since the clucking/ wheezing sounds only happens when she is breathing out, I'm a little worried about a respiratory infection. Any help would be great. Thanks!