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Description
Lake Sommen is quite deep and most of the lake is ice-free all-winter. During this period large amounts of Veliki ronac, Patka dupljašica and Ćubasti gnjurac winter in Sommen. Sometimes in the hundreds. Among these Ćubasta patka, Labud grbac, Veliki labud, Liska, and Sivi galeb can often be found. The lake is also home to quite a few rarer wintering birds like Crnogrli morski gnjurac, Srednji ronac, Suri orao, Crni turpan, Baršunasti turpan, Vodomar, Riđogrli morski gnjurac and Obični galeb.
During the spring migration marine ducks can be found in the lake. At the same time Riđogrli morski gnjurac, and Crnogrli morski gnjurac, arrive at the lake. Crnogrli morski gnjurac breeds in the lake while Riđogrli morski gnjurac feeds in the lake and breeds in small neighbouring lakes. The rare Žutokljuni morski gnjurac has been seen. Sommen archipelago hosts large colonies of Obična čigra, Sivi galeb, Obični galeb, Srebrnasti galeb, Siva čaplja and Veliki vranac. Among these some rare birds like Mrki galeb, and Arktička čigra can be seen.
The large decidous forests around sommen especially on Torpön host plenty of quite rare birds like: Mala muharica, Mali detlić, Lešnjikara, and Utina. Around Sommen there is also old conifer forests around which support large populations of woodpeckers. Vijoglava, Zelena žuna, Crna žuna, Mali detlić, Troprsti detlić (very rare), Veliki detlić and Planinski detlić (extinct in the area) have all been recorded. Other otherwise rare forrest birds found here are: Leštarka Veliki tetreb, Ruševac (Rocks mosse), and Lešnjikara.
During the autumn birds can be seen migrating through the lake. Most common are the doves, finches, terns, and waders. At Rocks mosse Ruševac and Veliki tetreb breed. At Visskvarn there are rapids where Vodenkos, and Potočna pliska can be seen.
Details
Access
The area is quite vast, and has got many places to get a good view of the lake. The area is quite mountanous and a walk can be straining. Click on a P in the map to get directions to that point.