The benign huntsman spider is the cause of many car crashes in the Australian outback – mainly because the appearance of a large spider inside a car has an alarming effect on the driver. The spiders, scorpions, insects, slugs, leeches, caterpillars and larvae that occur all over the world are all fairly repulsive to most people. Many species are completely harmless, but some do bite, burrow under your skin or suck your blood.