Nocturnal and arboreal, they appear quite sluggish as they remaining motionless for long periods of time waiting for prey to pass by. When prey does pass by, or if disturbed, they can strike quickly.
[edit
Their venom is a strong hemotoxin, and is potentially fatal to humans.
Kurt above infomation -- They can strike quickly -- potentially fatal to humans
I had both my hands on the camera body instead of left hand supporting the lens like i normally do...so the shots could be a bit shaky...]
Unbelievable and beautiful shots Kurt! If it had been me there instead of you, the viper would appear as the car named after it...a big BLUR. I would have turned tail and run! Poke it with a stick YIKES