Most people on Earth are habitats for mites that spend the majority of their brief lives burrowed, head-first, in our hair follicles, primarily of the face. In fact, humans are the only habitat ...

The first species, called Demodex folliculorum, lays its eggs in your hair follicle ... groups of humans migrated across the world. For example, a study found that European mites genetically ...

All of this is to say that if one can imagine a habitat, however narrow, mites are there, even if that habitat is hard to reach on legs just microns long and a tenth the thickness of a human hair.