Army ants are a nomadic breed. When the hive's queen finds a nice maternal place for a nursery they all settle down and grab on to each other to build a shelter while the queen lays a couple hundred thousand eggs. After the eggs hatch the rest of the ants fan out in a giant swarm devouring any little critter that can't run away fast enough. But some of those critters are sneaky little mimics that feel right at home with the ants.
—David Foss