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Ostträsket is known as one of the most important staging sites for geese and Серый журавль in Västerbotten during the spring.
During late April and early May hundreds of Гуменник and Восточный тундровый гусь are staging at lake Ostträsket. Most other species of geese also occurr in smaller numbers, as well as Лебедь-кликун and Серый журавль. Until a few decades Пискулька was regular here but it is nowadays very rare. Dabbling ducks may stay in good numbers, especially Чирок-свистунок and Кряква. Тетерев are lekking on the fields around Tällåsen.
There are plenty of Серый журавль also in August and September (up till several thousands). Серый гусь is the most numerous goose species during the autumn. Raptors like Орлан-белохвост, Полевой лунь, Дербник or Сапсан are regular. Степной лунь is more or less annual. Often interesting passerines feed on the fields, as Лапландский подорожник or Пуночка.
Though a visit may prove nice at any time of year, the summer months yield less birds. The amount of breeding birds in the lake is low, but it is used by feeding Малая чайка, and Чеглок and Скопа are not uncommon.
The only practical way to access Ostträsket is by Tällåsen in the western part. There is an informal vantage point in the village, as well as a birding tower by the meadows. To see Серый журавль or geese during the days you may want to drive around on the public roads between Drängsmark, Kågegården and Kåge.
The geese and Серый журавль usually spend the night on the lake's ice or in the flooded meadows, and fly to the fields when sun rises. They tend to feed in a large area around the villages of Drängsmark and Kåge, but often near the lake at Tällåsen which is also the best spot to see them flying to and from the night quarters. The best time to visit is about April 20th until May 5th, or in autumn around September 1st-20th.
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