My daughter brought home a little Bantam chick 2 days ago. We put it in with our youngest chicks and ducklings and everything seemed ok. Yesterday it started to seem lethargic and didn't want to eat or drink unless we put its beak in the water. and then yesterday afternoon we had a duckling get sick real sudden, had yellowish mucus coming out of its mouth and a rattly sounds when breathing. The duckling died within a few hours. As of this morning the chick has clear mucus and is gasping for air. Its poo is pure white and runny. He is still peeping and moving if I touch him but otherwise just lays there. I have two feed stores in town so I can probably get hold of any meds I need.