Battle on air

A flock of seven whooper swans landed to rest at Rantamo. Very soon one of the swans nesting there came, choose one of the visitors, I don´t know how, forced it to fly, then a short moment of battle in the air. Then the visitor landed back where the other were and the nesting swan flied away.

Normally the nesting swans force all the visitors go away. Why not this time. Perhaps the visitors had some kind of tickets or permissions to have a break at Rantamo.