Official

　The Sumida River is located along the Chuo-ohashi Bridge and Aioi Bridge south along the Sumida River School River (Harumi Canal), where the Sumida River diverted east near Tsukuda 2-chome upstream of Chuo-ohashi Bridge. With the adoption of Super dike, it has two steps of promenade, which can be connected by slopes.　　　　　　　　　　　　　　A lot of water birds fly, and you can see them foraging on the shore at low tide.　This time, common kingfisher (Jade) is featured.　　　　　　　　　　　　　Usually, you can see resting on rocks and branches on the waterside overlooking the feeding ground, but here they stay on the fence, pole at the northern end of the park. Occasionally, it also shows foraging behavior that jumps into the water.　　　　　　　　　　　common kingfisher belongs to the common kingfisher family, has a long beak, short neck, tail, and legs, has a scale-like pattern on the head, bright blue-green color of metal from overhead to back, white throat and ears, orange front and back of the chest, belly and eyes, and red feet. Male beaks are black, while females have red beaks.　　　　　　　　　　　　　　Feathers that shine on sapphire-like blue and emerald-like blue are color development phenomena derived from spectroscopy due to uneven microstructures on the surface, so-called "structural color", and the color changes slightly depending on the amount of light.　　　　　　　　　　　　It is called "gemstone of mountain stream" because of its beautiful appearance, and the kanji notation is the same jade as the gem name.　　　　　　　　　　　During the high growth period, the city center temporarily disappeared due to redevelopment, river pollution, etc., but it is said that it can be seen again at the waterside where water quality has improved in recent years.　　　　　　　　　　　　　　　　　　　　　　　However, in the city center today, instead of seafood and small aquatic animals living in the clear stream, crucian carp and motsugo, which are resistant to muddy water, crayfish in the United States and Shinnanuma shrimp in naturalized species, instead of digging holes in earth cliffs, we hear that nests are nesting using concrete-walled riverbank drain holes.