Native to South America and Africa is a genus of recluse spider known as Sicarius. They live in deserts and are known for their self-burying behavior. They can grow up to 1 to 2 inches in length and have 6 eyes. Yes, I said six eyes. They can live long periods of time without food or water.
Sicarius Spider: The Assassin
Rarely encountered by humans, which is good considering the venom is the most potent spider venom in the world, even more than the Phoneutria (wandering spiders) or Atrax robusta (Sydney funnel web spider).