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In page Ukko:

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A viper with a serrated line on its back was considered a symbol of thunder.[citation needed] Neolithic stone carvings have been found in Russian Karelia which have features of both snakes and lightning. It is, however, uncertain whether these are directly connected to the figure of Ukko. Evidence for worship of snakes is found among different cultures around the Baltic, including the Estonians and Finns.[2]