With millions of members in a colony, leaf-cutter ants cultivate their own food. Just like humans, they're farmers. Some of the ants set forth from the nest to find fresh vegetation; when they find it, they chew off large pieces that they carry back to the nest. However, the ants don't eat these leaves. Instead, smaller worker ants take the pieces of leaves, chew them into smaller pieces, and use these as fertilizer to grow fungus in large underground 'gardens.' The ants feed the fungus, and the fungus blossoms into small fruiting bodies which the ants later eat. Using this successful farming strategy, the ants build enormous nests underground, something spanning hundreds of square meters. Just like humans, they have perfected an agricultural civilization.