calidris alpina dunlin birds come together on pier

action alpina animal approach aves belly bill bird black bokeh breeding brown calidris charadriiformes collide collision commotion concrete curved dark directly dunlin eye feathers feet five flying focus gray group hard interaction into legs location long medium moisture more nature pier plumage popular puddle reddish rock rufous rusty sandpiper scolopacidae season shallow shorebird side size soft spotted standing step straight streaked stride surface talons thin three toes together trio underside water wet white wildlife wings