Hello. I have three wonderful mute swans. They were all stretching/resting their feet while swimming today and I noticed the bottoms of their feet all look strange. It looks like they have wounds or cuts on the bottom of their feet at each joint. I've never noticed this before and am not sure if it is normal. They are all acting fine and walking normally but I am concerned that there may be something that they need medical attention for. Thank you for whatever information you can provide.