White Wagtail Amur Wagtail Bird Pecking Moss Food on Wet Rock by Running Stream

white wagtail amur wagtail white wagtail forage bird eat motacilla alba water stream river brook feed black color plumage wing walk rock willie pied blackbacked japanese pied closeup one single animal wet stone peck bill beak stroll riverbank bank creek motacilla alba searching hunting hungry wildlife feathers korea animal behavior ground ornithology lone detail