northern rough-winged swallow gliding just above river surface

northern rough rough-winged swallow gliding river surface stelgidopteryx serripennis winged soaring low wings spread wide feathers fanned river fanned glint eye nature animal bird soar glide flight action active movement fast quick little beak bill forked tail dusky brown black white green blue reflections ripples bokeh sunlight shimmer outdoors wetland marsh swamp pond glisten travel migratory hirundinidae passeriformes speed speedy serrated edge