I had my ducklings outside today in the chicken tractor. They were outside from around noon until 6:00 or so. I just noticed that one of my younger ones, ~2wks, has really red feet. The webbing between his toes seems to be burnt. Is that possible? They aren't normally like that. They had shade, so they weren't in the sun all day unless they wanted to be. None of the other ducks have red feet, just the one. If not from the sun, what could it be? They are really red, but normally they are BRIGHT orange.