More than half of the wild birds seen in Japan are migratory birds.
Birds that come to Japan in the fall and spend the winter are called ``winter birds''. They mainly come from Russia, Siberia, and other northern regions to escape the harshness of winter, spend their time foraging in Japan, and return to their birthplace in the spring.
Birds that come to Japan in spring and spend the summer are called "summer birds." They come mainly from the southern hemisphere to escape the summer heat, raise their children in Japan, and return to their birthplace in the fall.
Birds that pass through Japan in spring and autumn are called ``traveling birds.'' They breed in countries north of Japan in the summer, spend the winter in countries south of Japan, and return to their birthplace in the spring.
Migratory birds are a seasonal feature of spring and autumn in Japan.
There are also many seasonal words related to migratory birds.
The color tone is inspired by migratory birds flying across the sky during the refreshing season.
There are 3 different colors.
