Beschreibung
More than 230 species of birds have been recorded in and around Østensjøvannet. In summer the lake hosts a large colony of Lachmöwe, as well as populations of Haubentaucher, Bläßhuhn, Teichhuhn and Reiherente. You can also find Rohrammer, Teichrohrsänger and the occational Waldlaubsänger here.
It is a popular area for recreation, and there is a path all around the lake with plenty of good viewpoints. The path brings you quite close to the water's edge. There is also a bird hide on the west side of the lake, which provies good views of the central parts.
During spring and autumn the lake is used as a stopover by numerous species, such as Löffelente, Ohrentaucher and waders.
In winter, large flocks of Stockente stay at the lake, with the occational Spießente and Pfeifente thrown in. Various geese and Bläßhuhn are also known to winter here. As a bonus, encountering Schwanzmeise is not uncommon during the colder months.
Details
Zugang
There is a parking site south of the lake. The area can also be reached by bus (Abildsø) and the subway (Skullerudåsen, Bøler). The paths around the lake are mostly prepared for biking, but walking around the lake (with plenty of stops) won't take more than about 2 hours (4,5 km).

