Just went to close the door to the barn amd we have ducklings in a closed in pen inside of the barn. One of the 4 week old.ducklings just ran around in crazy circles and flopped on its back. I picked it up and had to hold its head up. After a few minutes she seemed to hold her head on her own and just sat on my lap. When I put her back down in the pen, she doesnt want to walk and seems to be unsteady. This lasted a few minutes, then she walked around fine. I told my husband and he said she seemed unsteady last night, but was then fine after a few min. Any thoughts?