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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 morčák velký, hohol severní and potápka roháč winter in Sommen. Sometimes in the hundreds. Among these polák chocholačka, labuť velká, labuť zpěvná, lyska černá, and racek bouřní can often be found. The lake is also home to quite a few rarer wintering birds like potáplice severní, morčák prostřední, orel skalní, turpan černý, turpan hnědý, ledňáček říční, potáplice malá and racek chechtavý.
During the spring migration marine ducks can be found in the lake. At the same time potáplice malá, and potáplice severní, arrive at the lake. potáplice severní breeds in the lake while potáplice malá feeds in the lake and breeds in small neighbouring lakes. The rare potáplice žlutozobá has been seen. Sommen archipelago hosts large colonies of rybák obecný, racek bouřní, racek chechtavý, racek stříbřitý, volavka popelavá and kormorán velký. Among these some rare birds like racek žlutonohý, and rybák dlouhoocasý can be seen.
The large decidous forests around sommen especially on Torpön host plenty of quite rare birds like: lejsek malý, strakapoud malý, Ořešník kropenatý, and kalous ušatý. Around Sommen there is also old conifer forests around which support large populations of woodpeckers. krutihlav obecný, žluna zelená, datel černý, strakapoud malý, datlík tříprstý (very rare), strakapoud velký and strakapoud bělohřbetý (extinct in the area) have all been recorded. Other otherwise rare forrest birds found here are: jeřábek lesní tetřev hlušec, tetřívek obecný (Rocks mosse), and Ořešník kropenatý.
During the autumn birds can be seen migrating through the lake. Most common are the doves, finches, terns, and waders. At Rocks mosse tetřívek obecný and tetřev hlušec breed. At Visskvarn there are rapids where skorec vodní, and konipas horský 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.