Flies are holometabolousinsects (with complete metamorphosis) that have worm-like, legless larvae, which are often referred to as "maggots." The adults differ entirely from the larvae.
Flies typically overwinter as eggs or larvae; few do so as adults.
Most of the species have several generations per year; few Diptera have only one generation per year.
Their diet is highly varied. Some flies are phytophagous(plant feeders), a number are zoophagous(predators, parasites and parasitoids) and many are saprophagous (detritivorous). Depending on their diet, they may be found in a wide variety of habitats, both aquatic and terrestrial, such as under tree bark, in forest litter, on plant leaves, flowers and fruits, in decomposing organic matter, on humans and animals, etc.
Here are typical representatives of some families in this order. At least one species associated with these families is described in the site´s fact sheets.
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