Mated Pair Of Migrating Tundra Swans Swimming In The Blackwater National Wildlife Refuge. A Pair Of Migrating Tundra Swans Passing Through The Blackwater Nwr On Maryland's Eastern Shore In Cambridge, Maryland And Dorchester County

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bird waterbird ducks duck waterfowl beak wildlife goose wing swan shorebird nature seabird mated pair migrating tundra swans swimming blackwater national refuge nwr maryland's eastern shore cambridge maryland dorchester county sanctuary birds atlantic flyway freshwater impoundments brackish tidal wetlands united states river waters marshes species endangered winter migration geese nesting wintering native trumpeter food habits feeding north american whistling beak bird bill fly egg tail flock flight feather flight feathers wing chick aviary incubate nest nestling migration migrate rook roost rookery black marsh tidal marshland