And by comparing their DNA, scientists can trace how different groups of humans migrated across the world. For example, a study found that European mites genetically diverged from East Asian mites ...

This story appears in the February 2015 issue of National Geographic magazine. Currently two species of face mites are known; at least one of them appear to be present on all adult humans.

On a recent drive back from Denver International Airport, I saw a coyote running through a prairie-dog town. It was the fifth coyote I saw that morning between Estes Park and Denver, but this one ...