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Douglas Caldwell: Tundra Swan (cygnus columbianus) Portrait
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Douglas Caldwell: Tundra Swan (Cygnus columbianus)
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Douglas Caldwell: Mute Swans (cygnus olor)
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Douglas Caldwell: Mute Swan (cygnus olor)
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Douglas Caldwell: Wild Mute Swan (Cygnus olor)