adder
aggressive
animal
berus
biting
black
brown
closeup
common
common european
common european adder
crossed
danger
dangerous
detail
european
european adder
fear
fearsome
frightening
gray
herpetology
macro
mountain
nature
outdoors
poikilothermic
poison
poisonous
portrait
reptile
scales
scary
sharp
snake
toxic
unsafe
venom
venomous
vertebrate
vicious
viper
vipera
vipera berus
viperinae
wild
wildlife
zoology