adder
berus
closeup
common adder
common viper
cross
dangerous
european adder
european viper
forked tongue
herpetology
mild toxicity
mild venom
mountain
not very dangerous
ophidiophobia
pattern
poisonous
portrait
predator
red eye
reptile
scale
snake
tongue
toxic
venomous
vertical pupils
viper
vipera
vipera berus
zigzag