I have 3 khaki campbell duckling they are about a month old. i put them in my pond today and i noticed when the black one goes under water he shoots snot out of his nose. i tried to look into his mouth and when i do its like really thick salvia. i dont know what to do i need help. is he sick? is there an antobiotic? i cant go the vet either cause none of them know anything about waterfowl. is ot a cold?