Types of Snake Venom. Out of the 2900 known snake species in the world (2007 figures), only 450 are venomous, making it just about 15.50 percent of their entire population.
Out of the 7000-8000 Americans that are annually reported with snakebites, less than 15 die of the toxic poison. However, most people still panic on seeing a snake and try to kill it. Just like a dangerous person, for instance, a terrorist or murderer, cannot be identified by mere looks, neither can a venomous snake. Both of these are more of a threat to America, and indeed the world, than snakes ever were. Most snakes are not venomous, and even from those that are, only about 250 are capable of killing humans. The 10 smartest animals - Technology & science - Science. 6 Terrifying Ways Crows Are Way Smarter Than You Think. Mankind has a long and checkered past with crows and ravens: They have been feared as symbols of death, because they're all black and scary, revered as creators of the world because, well, it was either them or the seagulls, and worshiped as trickster gods, because of their baffling intelligence.
Intelligent enough, in fact, for us to start worrying ... #6.