the colony. Younger ants work within the nest protecting the queen and young. Sometimes, a queen is not present and is replaced by egg-laying workers. These worker ants can only lay haploid eggs producing sterile offspring. Despite the title of queen, she doesn't delegate the tasks to the worker ants; however, the ants choose their tasks based on personal preference. Ants as a colony also work as a collective "super mind". Ants can compare areas and solve complex problems by using information gained by each member of the colony to find the best nesting site or to find food. Some social-parasitic species of ants, known as the slave-making ant, raid and steal larvae from neighboring colonies. Excavation Ant hill art is a growing collecting hobby. It involves pouring molten metal (typically non-toxic zinc or aluminum), plaster or cement down an ant colony mound acting as a mold and upon hardening, one excavates the resulting structure. In some cases, this involves a great deal of digging. The casts are often used for research and education purposes but many are simply given or sold to natural history museums or sold as folk art or as souvenirs. Usually, the hills are chosen after the ants have abandoned so as to not kill any ants; however in the Southeast United States, pouring into an active colony of invasive fire ants is a novel way to eliminate them. Ant-beds An ant-bed, in its simplest form, is a pile of soil, sand, pine needles, manure, urine, or clay or a composite of these and other materials that build up at the entrances of the subterranean dwellings of ant colonies as they are excavated. A colony is built and maintained by legions of worker ants, who carry tiny bits of dirt and pebbles in their mandibles and deposit them near the exit of the colony. They normally deposit the dirt or vegetation at the top of the hill to prevent it from sliding back into the colony, but in some species, they actively sculpt the materials into specific shapes and may create nest chambers within the mound. See also Ant colony optimization, a technique in computer science inspired by ant colonies Nuno sa punso, a Filipino belief about ant hills References External links Journal of Insect Science: The nest architecture of the Florida harvester ant Myrmedrome, a realistic ant colony simulator Winged Ants, The Male, Dichotomous key