adder
animal
berus
biology
bite
black
body
brown
camouflage
center
common european adder
common viper
curled
danger
environment
european
european viper
eye
fear
grass
gray
green
grey
head
heating up
hide
hiding
hiss
hissing
nature
northern
northern viper
outdoor
poisonous
predator
predatory
preying
reptile
reptilia
resting
rolled up
scale
scaly
scary
serpentes
snake
squamata
sunbath
venom
venomous
viper
vipera
vipera berus
viperidae
viperinae
wild
wildlife