adder
aggressive
ammodytes
animal
attack
berus
biology
camouflage
common
crossed
danger
dangerous
deadly
dragon
endangered
europe
european
eye
fauna
forest
green
herpetology
horned
isolated
poison
poisonous
predator
protected
red book
reptile
sand viper in the sand
scales
serpent
serpentes
skin
snake
temperate latitudes
tongue
toxic
ukraine
venom
venomous
viper
vipera
wild
wildlife
wood
woodland
zigzag
zoology