One of my duckling was underneath its mother, and it started peeping. When I drew it out from underneath her, it was panting. I don't know if that has anything to do with the problem because it's 85 degrees out. Anyway, a little bit later I noticed it shaking its head and it looked like it had something stuck in its throat, and then brown foam started to come out of its nose and regular bubbles started to come out of its mouth (meaning it wasn't brown). After a bit it stopped, and started drinking a lot but I could still see brown in its nose. What's the matter with it? Is it sick? What should I do to help it?