I have 6 ducklings (assorted breeds purchased from TSC) that are approximately a month old. The duckling with the bleeding wing (? bleeding from pin feathers?) is a Pekin. They stay indoors but regularly go outside to swim in their tiny pool. Today, I noticed dried blood on the edge of both wings and underneath the wings of the largest duckling. My daughter thought it was feces and put her in their pool. I went to investigate and realized it's blood/dried blood. It washed off easily and didn't seem to bother her. I ignorantly thought the sharp pins(?) had lightly stabbed her & caused a small wound. The duckling has done well today & the others haven't seemed to notice. I brought them back in this evening and everything was normal until a few minutes ago. The bleeding started again. I can't find a wound anywhere. I was able to get the bleeding stopped easily without any treatment (cornstarch, styptic powder, etc). What can I do to help my duckling? Thank you in advance for your time and help.