I stitched my peachicks with regular sewing thread, as advised by a college animal lab technician who is also an experienced rehabber! It's fine to use what you have on hand, and it should be left in until the tissue heals. However, since the thread will not disintegrate like surgical suture, you will need to remove the stitches in about seven to ten days. Just clip the knots and gently pull the thread. It should come out fairly easy, but it may be a bit hard to find it through the feather buds that will probably have grown in around the injured area. Just use your fingers to locate the little bits of thread sticking out.