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A mandarin duck is seen in the Royal Baths park in Warsaw, Poland, Dec. 31, 2020. (Photo by Jaap Arriens/Xinhua)
A mandarin duck flaps its wings in the Royal Baths park in Warsaw, Poland, Dec. 31, 2020. (Photo by Jaap Arriens/Xinhua)
A flock of mandarin ducks are seen in the Royal Baths park in Warsaw, Poland, Dec. 31, 2020. (Photo by Jaap Arriens/Xinhua)
A male mandarin duck courts a female in the Royal Baths park in Warsaw, Poland, Dec. 31, 2020. (Photo by Jaap Arriens/Xinhua)
A mandarin duck is seen in the Royal Baths park in Warsaw, Poland, Dec. 31, 2020. (Photo by Jaap Arriens/Xinhua)
