Finland’s common crane (Grus grus) population has grown in recent decades, and the species has expanded its nesting range from swamps to reed beds growing in lakes and bays.
A pair of common cranes claimed Vanhankaupunginlahti as their territory in 2013, but it is unknown how many times they have attempted to nest there, if indeed they have. The pair can often be seen on Lammassaari island, in the wet, western part of the island’s meadow. Sometimes they dance in the meadow, and at other times their calls can be heard echoing among the reeds.