Tundra swans are seen at the Aylmer Wildlife Management Area in Aylmer, Ontario, Canada, on March 19, 2025. From late February to early April each year, thousands of wild tundra swans use Ontario's Aylmer Wildlife Management Area to refuel their migration to the high Arctic Region. (Photo: Xinhua)

Tundra swans are seen at the Aylmer Wildlife Management Area in Aylmer, Ontario, Canada, on March 19, 2025. From late February to early April each year, thousands of wild tundra swans use Ontario's Aylmer Wildlife Management Area to refuel their migration to the high Arctic Region. (Photo: Xinhua)

Tundra swans are seen at the Aylmer Wildlife Management Area in Aylmer, Ontario, Canada, on March 19, 2025. From late February to early April each year, thousands of wild tundra swans use Ontario's Aylmer Wildlife Management Area to refuel their migration to the high Arctic Region. (Photo: Xinhua)

Tundra swans are seen at the Aylmer Wildlife Management Area in Aylmer, Ontario, Canada, on March 19, 2025. From late February to early April each year, thousands of wild tundra swans use Ontario's Aylmer Wildlife Management Area to refuel their migration to the high Arctic Region. (Photo: Xinhua)