抄録
I found a new plant species being added to the food list of the Bewick's Swan Cygnus columbianus . It is Cardamine scutata Thunb. , a herbaceous plant belonging to the Brassicaceae. I observed that a group of Bewick's Swans were grazing leaves and stems of the plant on stubble of rice fields in Echigo Plain where is a wintering ground of the swan, on 6th March, 1994.
