<P> Ant nests feature an elaborate colony structure that may extend 2 metres (6.6 ft) or more underground . As the structure gets further underground, individual chambers become farther and farther apart indicating that the ant is aware of its depth . It is hypothesized that they accomplish this by sensing the level of carbon dioxide in the soil . The leaf cutter ant builds a complex nest which can house 8 million individuals . Its nests feature numerous chambers, most notably garden chambers where they farm fungus on leaves they harvest from the forest . </P> <P> Species such as the carpenter ant and the wasp Polistes exclamans build "satellite nests" - smaller nests near, but separate from, the main nest . These satellite nests are used as an insurance against predators and parasites; if the original nest is attacked, surviving members can move the satellite nest . Other species such as the Black hover wasp, Parischnogaster alternata, construct nests in clusters with the central core composed of older colonies surrounded by younger colonies . </P> <P> The Eastern carpenter bee, Xylocopa virginica, is unique in that individuals of that species build their nests in wood, bamboo culms, agave stalks, and other similar materials, although their preferred nesting material is pine or cedar lumber . When digging the nests, they use the wood shavings scraped from the wall to create partitions within the tunnels . The nests are usually round and have about 1 - 4 tunnels, each with multiple branches . Because these materials are often useful for humans in construction, X . virgininica's nesting behavior presents the disadvantage of weakening wood in manmade structures . </P> <P> The abundance of biological resources within the nest has led to a number of specialized predators . The aardvark and the ant eater use long tongues to prey upon termite and ant nests . Birds such as the honey buzzard specialize on wasp and bee nests, a resource also targeted by the tropical hornet . Symbiosis, ranging from feeding on waste to obligate parasitism, is common within the nest . Ant nests alone support symbiotes spanning six classes of arthropods which includes 35 families just from the beetles . </P>

What kind of animals live in nests known as drais