This is the most common domestic fly and makes up 91% of all flies seen in human habitation. An adult house fly is about 8 – 12 mm in length. It has a grey thorax and has four distinct dark longitudinal lines on its back. Its whole body is covered with hairy projections.
Females are slightly bigger than males and can be distinguished by having a bigger space between their compound eyes which are red in color. It mainly has only one active pair of wings as the hind pair is small and only aids in stability during flying.
A female can lay up to five hundred eggs in batches of 75 – 150. These are white in color measuring 1.2mm long. These eggs hatch in a day into larvae that typically thrives on decaying matter and filth such as feces. After a week, it changes to a pupa of a reddish brown color that is 8mm long.
From this pupa, an adult fly comes out, and it can live for between two weeks to a month. Just after a minimum of 36 hours an adult female is ready for mating. It needs only one mating session after which it stores the sperm to use repeatedly in the laying of a number of sets of eggs.
House flies like to live in warm temperatures and develop faster during such times. They are a health hazard as they can carry a lot of harmful pathogens that can cause diseases such as typhoid, dysentery and cholera among others.