Coots are seen in man-made floating nests in a pond in the Royal Baths park in Warsaw, Poland, on June 21, 2020 . Initiatives were taken to warn cyclists and pedestrians to avoid ducks crossing the roads near the Royal Baths Park in Warsaw. (Photo by Jaap Arriens/Xinhua)

A rider on an electric scooter is seen crossing a sign warning users of crossing ducks in Warsaw, Poland, on June 23, 2020 . Initiatives were taken to warn cyclists and pedestrians to avoid ducks crossing the roads near the Royal Baths Park in Warsaw. (Photo by Jaap Arriens/Xinhua)

Coots are seen in man-made floating nests in a pond in the Royal Baths park in Warsaw, Poland, on June 21, 2020 . Initiatives were taken to warn cyclists and pedestrians to avoid ducks crossing the roads near the Royal Baths Park in Warsaw. (Photo by Jaap Arriens/Xinhua)

An advertisement at a bus stop is seen warning people of ducks crossing local roads in Warsaw, Poland, on June 23, 2020 . Initiatives were taken to warn cyclists and pedestrians to avoid ducks crossing the roads near the Royal Baths Park in Warsaw. (Photo by Jaap Arriens/Xinhua)

A coot is seen in a nest it has built on a man-made island in Warsaw, Poland, on June 23, 2020 . Initiatives were taken to warn cyclists and pedestrians to avoid ducks crossing the roads near the Royal Baths Park in Warsaw. (Photo by Jaap Arriens/Xinhua)