
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)