(c) John Baker - Amphibian and Reptile Conservation (www.arc-trust.org)

<i>Vipera berus</i> .Adder - a beautiful reddish brown juvenile
   
Vipera berus .Adder - a beautiful reddish brown juvenile
   
The Adder shows the greatest variation in colour of any of our snake species. Juveniles in particular, like this one, can be a reddish brown in colour. Occasionally this coloration can be carried into adulthood as well. Also clearly seen is the vertical pupil unlike our other snake species.