These hairy, multi-legged, eyeless creatures look like alien monsters from a horror movie. But they are in fact mites that measure barely a millimetre in length, magnified by the power of the electron microscope. Mites are tiny arachnids that are distantly related to spiders and scorpions. There are an estimated 50,000 species that are found on every continent of the planet. Welcome to the world of the mighty mites.