Crematogaster rogenhoferi

Lives mainly in trees and is one of the few species in the world that builds nests from natural materials mixed with its own saliva. Using soil and leaf litter, it builds outward from the fork of branches, so the nest hangs in mid-air, hence the Chinese name "hanging-nest". After mating, new queens gather to found colonies together, then select the strongest queen to carry on breeding. The nest site withstands strong wind and keeps out the rain, and the material itself is wind- and water-resistant; after a typhoon you can often see the tree snapped off but the nest still intact. They are among the finest architects of the ant world. The body is orange-brown with an all-black, teardrop-shaped gaster, which they normally hold raised in alert. Their formic acid is strong, and the species is highly territorial: usually only one colony occupies a tree and no other colony of the same species is tolerated. Larger colonies have one big main nest plus smaller satellite nests at the tips of other trees, like outposts, securing the whole tree as a single colony's territory. They forage downward from the main nest over long distances, and because individuals are small they march in tight columns. Workers are monomorphic with no soldier caste.