Examples of insects with halteres are houseflies, mosquitoes, gnats, and craneflies. Houseflies have many predators, including birds, reptiles, amphibians, various insects, and spiders. After hatching, the nymphs feed on small insects such as houseflies and fruit flies. They will also take prey closer to the ground such as cockroaches or houseflies. Houseflies also transmit poliomyelitis by carrying the virus from infected faeces to food or drink. Other diseases carried by houseflies are Salmonella, tuberculosis, anthrax, and some forms of ophthalmia. Houseflies appear in literature from Ancient Greek myth and Aesop's "The Impertinent Insect" onwards. Houseflies ("Musca domestica") have a mutualistic relationship with the bacterium "K. oxytoca". The pathogenic fungus "Entomophthora muscae" causes a fatal disease in houseflies. Adult houseflies are diurnal and rest at night. Houseflies have a small number of chromosomes, haploid 6 or diploid 12. The final game story involves mutated houseflies defending their world against an alien attacker. Most look rather like small houseflies, but are commonly drab grey. Adult houseflies are usually long with a wingspan of . In 16th- and 17th-century European vanitas paintings, houseflies sometimes occur as "memento mori".