What are zombie bees?

Zombie bees, or zombees, are honey bees infected by a parasite that causes the bees to fly at night and lurch about erratically until they die. Experts worry that the parasite, created when parasitic flies lay eggs inside living bees, could undermine the pollination of crops. Zombie bees were first discovered in California in 2008, but they were reported this week in Washington state. They have also been reported in Oregon and South Dakota. Parasitic flies can not infect humans.