If you see a marked swan, you can contribute to our data collection efforts. What was the swan doing? Was it interacting with other swans or waterfowl? Where was it located?
Tell us by filling out a google form at:
https://forms.gle/GdKyqSXFg7DBQhEb9
If you can identify a neck collar or leg band, please report that information to the Bird Banding Lab, run by the USGS Patuxent Wildlife Research Center: