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Tundra Swans rousting in the river in Blackwater National Wildlife Refuge. Royalty Free Stock Photo

Two male Northern Shoveler ducks on the river in Blackwater National Wildlife Refuge. Royalty Free Stock Photo

Swans and ducks gather in the shallow water amongst the marsh grasses with frozen water and distant mountains visible at the wetlands of Lower Klamath National Wildlife Refuge in southern Oregon.