Hello! I am new duck owner so I can take all the help I can get. I recently bought 3 ducklings about 2 weeks ago. They have been doing great. For the past couple of days , I noticed one of them will not extend its neck. It just sits its head on its chest. When I move the neck, he doesn’t seem to be in pain, but it is very stiff and usually won’t go too far until he puts its back down to his chest. Other than his neck, he drinks and eats good. Another issue I noticed was his breathing is a little bit heavier. That might be from his neck being held down to his chest. His head doesn’t look upward, he looks straight in front of him. He walks fine, but he is not as active as the others. He also did not suffer any injuries that I am aware of.Any advice on what it might be and anything I can do to help it would be great considering I do not have a vet close by that specializes in birds. Thank you!