Hi I'm new to ducks, I have three ducklings that are about three weeks old. They just have a darkening crust on top of their feet. My husband took a piece of it off and underneath the skin looked fine. The bottom looks pretty good too as you can see from the pictures. They have no problem walking a fact proven by my husband trying to catch them. But I'm worried and would like to know what is the best way to proceed, clean their feet, remove it, and use antibiotics? or is it something that requires a vet? We keep them outside during the day in an 8ft x 10ft, 8ft high cage with no floor only the grass that is growing, we move it every 2-3 days from location (not an easy task). At night they sleep inside in a straw filled box, which we also change every 2-3 days. They have a small bath they can wash in which we clean daily. I also have two goslings and I'm worried it could be contagious.