Scientists have determined that Varroa mites are a huge danger to honey bees. These parasitic creatures suck the pollinators' blood, transmitting a number of viruses and causing rapid declines in colony health. New research being performed at Washington State University is showing that mushroom spores can actually kill off the mites, before the mites kill off the colony. This video by bioGraphic further explains the threat of the Varroa mite, and how using mushrooms as a natural killer could save millions of honey bees.