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