Image: João P. Burini
The Brazilian Wandering Spider is nowhere near the biggest spider in the world. In fact, at only five inches across, it is pretty small, but do not be fooled by this. According to some researchers, this is the deadliest arachnid on the planet, and it is both highly aggressive and territorial. Sometimes called the Banana spider because many are found in bunches of the fruit, this beast is definitely one to avoid.