The interaction between parasites and their hosts can be gruesome: They manipulate, invade and terrorize their unsuspecting hosts, often killing them in the process. From mind-controlling organisms to ...

Parasites rarely settle for a simple relationship with their hosts. In fact, some of the most fascinating creatures in this category actively change how their victims behave. Among them are horsehair ...

Horsehair worms look like simple creatures on the surface, but they're actually some of nature's most sophisticated bodysnatchers. These parasitic worms, which resemble dark and stringy horse hair, ...