My duckling around 4 weeks old has started having seizure like symptoms, I was in the room where their brooder was when I heard someone fall, I looked into the brooder to see one of the ducklings laying on her side with her head tucked in, she started flapping her wings and rolling onto her other side, I got her to sit up but her eyes were watery and she was shaking her head. When I went in a few minutes later she was fine but I'm concerned.