A pair of whooper swans, a natural monument and winter bird, flies over Gyeongpo Lake in Gangneung, Gangwon Province when the cold wave began. 

 

Photos by Yoo Hyung-jae 

 

[Yoo Hyung-jae, who took these pictures, is a photo reporter at Yonhap News Agency who specializes in the ecological field.] 

 

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