White Wagtail or Amur Wagtail Bird Eating Green Algae in Shallow Running Creek Water Flow on Sunny Day, Japan

white wagtail feed eat food peck creek amur wagtail cascade white wagtail forage bird motacilla alba water stream river brook black color plumage wing walk rock willie pied blackbacked japanese pied closeup macro detail one single animal alga algae green moss underwater legs in water shallow around stone rocky mountain rapids fast flowing bill beak