A report from the Helsinki Environment Centre (via the Yle public broadcaster) indicates that the population of flying squirrels has substantially increased. This is based on an assessment of flying squirrel habitats, which provides evidence of squirrel activity. Estimates suggest the population has more than tripled, with most of the population found in Helsinki’s northwest. Looking for evidence of habitats is the best way to gain evidence about the population, such as looking for droppings, since the flying squirrels are hard to spot.
The Siberian flying squirrel (Pteromys volans) is the only species of flying squirrel found in Europe. The coat is gray all over, the abdomen being slightly lighter than the back. The squirrels are so-named because they are able to glide from one tree to another with the aid of a patagium, a furry, parachute-like membrane that stretches from wrist to ankle.
Last year some 12 squirrels were spotted; in 2016 the number is around forty. The greatest number have been spotted in the city’s wooded Central Park. Here there are some 25 recorded habitats (which compares with just six observed in 2014). Although some people regard the squirrels as a pest, they are protected by law nationwide in Finland. This is because the squirrels are classed as endangered, as a result of habitat loss, most of which stems from human activities. To thrive, the squirrels require mixed forests. Those who are less keen of the squirrels return are those tasked with building and planning, since any development must place the protection of the squirrels at the top of the planning agenda.
Speaking with the BBC about the change in trend, Esa Nikunen, who runs the Environment Centre, said: “It’s clear that after many decades of absence the flying squirrel has returned in droves to the capital.” This has come about, the conservationist explains, through controlled management of woodland. Success has also come from the construction, and careful siting, of treehouse-inspired structures.
