Beautiful photos!
I managed to snap a quick shot of an adder myself, when I was in Sweden, though my photo isn't nearly as pretty. It was at a moose park, right next to the trail...just a lucky find. Cutest little thing! It was a cool day, and it had come out to bask a bit, most likely.



From what I understand, while protected, they aren't too terribly rare. (Or, the protection has been doing them some good).

We didn't pester him, but he eyed us dubiously after we snapped a few photos, and then crept slowly away.