As defined by entomologists, a fly (plural flies) is any species of insect of the order Diptera.
These typically have one pair of true wings, with the hind wings modified into halteres.
Flies are common amongst humans and some can cause the spread of serious diseases such as sleeping sickness.
The housefly (Musca domestica) and mosquito are particularly common amongst humans.
Other flies, such as the horse fly (Family Tabanidae), can inflict painful bites.
The larva of a fly is commonly called a maggot..
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