Army ants are a group of aggressive, nomadic ants known for their large colonies and coordinated hunting behavior. They do not build permanent nests; instead, they create temporary shelters called bivouacs using their own bodies. These ants are famous for their ability to swarm and overwhelm prey, which can include insects and small animals. The most well-known species of army ants belong to the subfamily Ecitoninae. They are found primarily in tropical regions of Central America and South America. Army ants play a crucial role in their ecosystems by controlling pest populations and recycling nutrients through their predatory activities.