“It's like, how much more black could this be? And the answer is none. None more black.” – Nigel Tufnel, This is Spinal Tap.  

The Gaboon viper is a fairly docile creature, and that’s where the good news ends. It also has the longest fangs of any snake—2.2-inch-long weapons that swivel forwards like switchblades. The fangs are connected to such huge glands that they deliver more venom than any other snake—a cocktail of toxins that thin the blood, trigger massive internal bleeding, and can stop hearts.

And to make things much, much worse, the Gaboon viper is virtually impossible to see.

From above, its head looks like a ...