The leafcutter ants (Atta sp.) forage for leaves some distance from their nest. They find their way home by producing and laying down pheromone trails as they move away from the nest. These pheromones are so powerful that each ant produces one billionth of a gram. One gram of pheromone would easily be enough to make an ant trail all the way around the world.
Fungus grown by the ants themselves
Ants live in the forest floor and soil beneath in the warmer regions of Central & South America
Leafcutter ants cannot eat leaves. Instead, they carry the cut pieces back to the nest and use it as a compost to cultivate fungus; this fungus is their food. The fungus cannot survive outside the nest or reproduce without the ant’s help.