First of all, the picture quality is so poor you can’t be sure, the details are just not recognizable.
However , I don’t think that this is a viper. The head is not distinct from the neck, as FWK already pointed out. The body is more elongated as in a typical viper, it looks more as a colubrid for me. The pattern on the back is not your typical zigzag you would normally expect form a European viper (at least from Vipera berus or Vipera ammodytes). What I am able to recognize from the pictures seem to be single blotches, they are not connected with each other. Every V. ammodytes I saw (or any picture I know) shows either a “real” zigzag pattern or at least big blotches which are all connected with the next blotch by a little thin line.
My first thought was the leopard snake (Zamenis situla), but here the blotches should be reddish to brown with a black border. I can’t see something like this.
So I *think* this is a smooth snake (Coronella austriaca). There is the marking on the head which looks like a “U”. There is also another row of blotches at the flank of the snake. The smooth snake is known to have a reddish color variation, so in my opinion this is the best bet from what you can recognize from these pictures.
Here is a link to a smooth snake from the Balkan which looks similar.
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Coronella austriaca, Smooth Snake, photo fid4184 | Balcanica.info
Btw – a smooth snake looks like a viper, but is totally harmless for humans.
Roman
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