北海道札幌市におけるヨシガモAnas falcataとマガモA. platyrhynchosの雑種の日本初記録

抄録

I found an adult intersex presumed wild hybrid between a Falcated Duck Anas falcata and a Mallard A. platyrhynchos at Hassamu River, Tonden, Kitaku, Sapporo, Hokkaido on 28 March 2019. This is the first record in Japan, and an uncommon record in the world.