asian or green pit vipers trimeresurus viperidae beautiful little green snake with big head and brown tail sleeping on tree root

adder aggression aggressive animal asian attack bite colorful creature creepy danger dangerous deadly endangered exotic eye green head health herpetology hunter jungle lethal medical nature pattern pit poison poisonous predator reptile serpent snake stick thailand toxic trimeresurus tropical twisted venom venomous viper viperidae vipers wildlife yellow zoology