Photo de stock - 20 April 2021, Berlin: A mute swan scares away a competitor on the Havel in Grunewald. The longer days of spring get the hormones going, the breeding and sowing season has begun - also for swans. Photo: Paul Zinken/dpa-Zentralbild/dpa. - Berlin/Berlin/Germany

Photo de stock: 20 April 2021, Berlin: A mute swan scares away a competitor on the Havel in Grunewald. The longer days of spring get the hormones going.

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