ants rely on trails of pheromones army ants scent ants use important in any ecosystem scent ants use which contains about 1,100 species important in any ecosystem ants rely on trails of pheromones Dracula ants ants rely on trails of pheromones army ants Dracula ants species of farming ants ants rely on trails of pheromones Why Ants Rule the World important in any ecosystem scent ants use which contains about 1,100 species