Photo taken on April 18, 2020 shows a couple of wild swans in a pond in Nur-Sultan, Kazakhstan. The wild swans make a temporary stop here before they resume their migration, according to local authority. (Photo by Kalizhan Ospanov/Xinhua)

Photo taken on April 18, 2020 shows a couple of wild swans flying in Nur-Sultan, Kazakhstan. The wild swans make a temporary stop here before they resume their migration, according to local authority. (Photo by Kalizhan Ospanov/Xinhua)

Photo taken on April 18, 2020 shows a couple of wild swans in a pond in Nur-Sultan, Kazakhstan. The wild swans make a temporary stop here before they resume their migration, according to local authority. (Photo by Kalizhan Ospanov/Xinhua)

Photo taken on April 18, 2020 shows a wild swan in a pond in Nur-Sultan, Kazakhstan. The wild swans make a temporary stop here before they resume their migration, according to local authority. (Photo by Kalizhan Ospanov/Xinhua)

Photo taken on April 18, 2020 shows a couple of wild swans in a pond in Nur-Sultan, Kazakhstan. The wild swans make a temporary stop here before they resume their migration, according to local authority. (Photo by Kalizhan Ospanov/Xinhua)