I just got some ducklings in the mail from a breeder today. They were in the post office for a day bc I couldn't get there on time yesterday. They all seem fine, except for one that's acting weak and wobbling its head a lot. I'm worried that it might be sick or dying from the stress of shipping. Is there anything I can do to help it? I gave it some poultry cell and some water to see if that helps. Thanks.