Bewick’s Swans breeding in Chaunskaya Bay in the Russian Arctic are known to winter in Japan. Dr. Diana Solovyeva captures them at their breeding grounds, and attaches plastic collars and leg bands (called color markings) to them. This is a study to document annual survival of the swans, family formation, age of the first reproduction, and family divorce.

In collaboration with Dr. Solovyeva, we compile a list of marked swans on this website by organizing the observation records from swan watchers all over Japan. Click on the "三" button at the top left of the home page, and you can view the sighting records of the swan by selecting the number of the collar/band numbers.