Photo de stock - Whooper swan (Cygnus cygnus) and Bewick's swan (Cygnus bewickii) at daybreak, preening and gathering on the the partly frozen lake where they have been resting for the night, a flock of mallards (Anas platyrhynchos) flying by, The Netherlands, Drenthe, Bargerveen national park

Photo de stock: Whooper swan (Cygnus cygnus) and Bewick's swan (Cygnus bewickii) at daybreak, preening and gathering on the the partly frozen lake where they have been resting.

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