DICE SNAKE / WUERFELNATTER / NATRIX TESSELLATA
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A wall on the shore of the lake of Zurich has lost most of its mortar and is now used for hibernation by dice snakes. I was lucky enough to pass there on the first warm days of the year when they slowly returned to "life".
The larger one is most likely a female, the smaller one might be a male.
They don't exatly belong to this region and may have been set free here by somebody. As they are completely harmless - at least for us humans - there's no reason to panic ;-)
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Tinu