full length image of vipera ursinii rakosiensis

adder animal beautiful brown closeup coldblooded color colorful creature danger dangerous deadly early endangered endemic environment european full habitat hatched herpetology hibernation iucn length meadow moult natural poison poisonous protected rakosiensis rare reptile reptilian snake species spring threatening toxic toxicity transylvania ursinii venom venomous viper vipera viperidae viperinae wild wildlife zoology