The Eurasian coot (Fulica atra) in the Arakawa River in the city of Kofu, Yamanashi Prefecture.
https://en.wikipedia.org/wiki/Eurasian_coot; https://flightforsurvival.org/birds/common-coot/
Eurasian coots, Arakawa River, Kofu, Yamanashi, 1/29/2025
Eurasian Coot in the Arakawa River, Kofu