Yesterday when I went to go let my 2 month old ducks out of their house, one of them was limping. Over the past 24 hours, it has gotten worse and he/she has to use its wings to stable itself when it stands up. The left foot is turn inward at like 45 degrees. It prefers to just lay around. I have inspected it and I don't feel any broken bones, no inflammation, nothing I see wrong with it. Any ideas?