I have 3 ducklings that are about 2 weeks old. One is a Blue Swedish and the other two are Indian Runners, all female. I have noticed when they are laying down in their enclosure, a strange sound coming from one of them, almost a wheezing and sometimes clicking when they breathe (almost like there is something stuck in there) I have not seen any discharge from their bills, however I noticed some unusually watery and light brown stool from one of them. I am wondering if their vocals may be changing, or if I may have some ill ducklings. Does anyone have any words of advice? Should I take them to my veterinarian?