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Whilst they will often be linked to inadequate hygiene within a certainly location, cluster flies usually do not take with them diseases and thus do not signify a risk to people particularly since they will not lay their eggs within the food of human beings. As an alternative they much choose to turn their curiosity earth worms instead and look to get their eggs close to the burrows of earth worms. They'll either make this happen in soil or on leaves which have been aging. When their eggs have eventually hatched the cluster flies larvae will be looking to locate earthworms and will look to feast upon them obtaining their nutrients through the body of the earth worm. This may cause significant amounts of injury to the earthworm and will eventually kill them. Once the Cluster flies larvae have evolved to a fully developed adult, they will likely depart the earth worm because they are now fully capable of supporting themselves. Nonetheless even though they won't cause any real trouble to humans they can nevertheless be a great annoyance to us if they are generally in our surroundings. Cluster flies are generally outdoor flies however, if the weather conditions becomes much cooler, in late autumn and winter for instance, they will often choose to move inside, sometimes in their thousands, and will be found hibernating in structures or attics, thereby the reason they are generally referred to as "attic flies". They favour inaccessible places for instance inside the walls, inside of breaks and cavities close to the ceiling or around windows, or even in basements, lofts as well as other rooms that are not used frequently. If the weather warms up somewhat, they could start flying around and anyone who has ever experienced an invasion of cluster flies will tell you this is not a pleasurable experience. Houses and buildings that are in the country side could be more vulnerable to bringing in cluster flies because of the simple fact that there are less places for the adult flies to find shelter. You're also more likely to find cluster flies in structures which are situated in close proximity to where earthworms are present, for example areas of turf or grass, gardens. Cluster flies look much like the normal housefly though they are a bit bigger in size and will be identified by physical markings like the yellowy golden coloured hairs about the thorax and also by the different shades of grey across the abdomen. Additionally they move more lethargically than the common housefly
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