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Description
More than 230 species of birds have been recorded in and around Østensjøvannet. In summer the lake hosts a large colony of Мартин звичайний, as well as populations of Пірникоза велика, Лиска звичайна, Водяна курочка and Чернь чубата. You can also find Вівсянка очеретяна, Очеретянка ставкова and the occational Вівчарик жовтобровий 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 Широконіска північна, Пірникоза червоношия and waders.
In winter, large flocks of Крижень stay at the lake, with the occational Шилохвіст and Свищ євразійський thrown in. Various geese and Лиска звичайна are also known to winter here. As a bonus, encountering Ополовник звичайний, або синиця довгохвоста is not uncommon during the colder months.
Details
Access
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).