Aix galericulata
It is the etymology of the mandarin duck couple, as males and females are often seen mating. However, the pairs of Aix galericulata seem to change every year. Male breeding season is very beautiful and famous.
Every year at the end of spring or the beginning of summer, ducks often walk near ponds and rivers with their young. I think there are many people who see it. A walk of a spot-billed duck parent and child in the city is also news.