Tundra Swan Gliding Along The Marsh In Blackwater National Wildlife Refuge. Tundra Swan Gliding Along The Marsh In Black Water Nwr. The North American Population Is Often Called The Whistling Swan.

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bird animal waterbird ducks beak waterfowl wildlife wing mallard goose swan water nature reflection shorebird seabird mute gliding marsh blackwater national refuge black nwr tundra tudra american whistling swans nesting arctic migrating wintering trumpeter wetlands adapted feeding marshland low-lying flooded wet seasons high tide waterlogged coastline coast grass grasses cattails bog mire feather sanctuary birds atlantic flyway eastern shore cambridge maryland dorchester freshwater brackish tidal wetlands united states fish tea-colored waters marshes species threatened endangered plants marshes winter migration geese ducks delmarva