My approximately 18 wk old White Rock is making a constant duck-like sound. It seems like is has something to do with her breathing. She is eating and drinking fine, so much as I can tell. When she does drink, she is still making this weird sound. When we left home earlier today, she was in the nesting box so we thought she was working on laying an egg, but when we came home she was out of the nesting box making this duck-like sound. Does anyone have any ideas?