The Infestation: The Fringed Ornamental tarantula has been known to cause a coma to some of the people it has bitten.
The Brown recluse spider, and the Chilean recluse - both extremely.
The Mouse Spider and the Sydney Funnel-Web spider - both tiny - can bring down a full-sized adult if an anti-vemon isn\'t administered quickly enough.
The Chinese Bird Spider, known for its extreme aggression, has caused at least one infant death and has a venom which kills 50% of the lab mice it was tested on.
The Infestation: The Fringed Ornamental tarantula has been known to cause a coma to some of the people it has bitten