Preliminary data from BirdLife Finland suggests that over 4,000 pairs may be nesting in Finland at the moment.
In the fifties, the species was a rare sighting in Finland. By the end of the eighties only a maximum of 1,000 pairs were nesting in the country.
If the species continues to flourish at the present rate, Finland could be home to over 7,000 whooper swans by the end of the decade.
The swans are most common in areas of southern and central Finland.
YLE24, Finnish News Agency