Several of my ducks have sustained what I believe is frostbite damage to their feet. This is my first winter with them and I didn't know to keep the ground covered in hay until it was too late I fear. The lone toe (very swollen)on several feet look something like this brown (khaki) foot. The orange one is my crested male. Everything but this lone toe looks great. Please if anyone has suggestions on how to treat this please let me know. I have no other place to keep them other than the poop/ice/hay/ice/poop/hay layered pen.