This video shows an adder in the Netherlands.
Nick van der Marel made this video.
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Dear Kitty. Some blog 
Hi, this is unrelated to your post but I had to share it with you. After all, it is here that I have learned about the butterfly effect:-)
http://uk.eurosport.yahoo.com/blogs/early-doors/star-instant-karmic-reward-saving-butterfly-life-123557493.html
Regards
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Thank you for this beautiful butterfly link!
All best wishes for you, homeyra!
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I believe I saw one of these on Canvey Island. She (?) was sunning herself tucked in by a wall. The marking were the same (such a beautiful pattern) but I’m certainly no expert and could well be wrong.
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Hi Jill, thanks for your comment! Adders do occur around Canvey Island:
http://www.essexfieldclub.org.uk/portal/p/Adder+Vipera+berus
Grass snakes don’t have a zig zag marking on their backs, and are usually bigger.
Female adders are usually bigger than males.
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It was quite big, yes. I was really surprised when I saw it. It was the first time I’d seen a snake that wasn’t someone’s pet or wasn’t behind glass!
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Hi, grass snake pictures are at
https://www.google.com/search?q=grass+snake&source=lnms&tbm=isch&sa=X&ei=iAZAUuCjCrOY1AXhqIGwDg&ved=0CAkQ_AUoAQ&biw=1320&bih=611&dpr=1.09
Are you sure it was the (smaller; less common) adder species?
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It definitely had the diamond patterning on its back. I remember being struck by how vivid it was, but more than that I couldn’t say.
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Then, you probably saw an adult female adder 🙂
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