Flies belong to the order Diptera, and are classified as insects with a single pair of wings. The order contains an astonishing 240,000 estimated species, including gnats, midges and mosquitoes. It doesn’t include other insects known as flies, such as dragonflies, as these have more than one pair of wings and belong to a different order. Only ‘true flies’ have a single pair of wings.

Flies have evolved to be great fliers, and have short and streamlined bodies for the purpose. The part of their bodies that contains the flight muscles is greatly enlarged, while the rest is much reduced. The third segment of a fly’s body (or thorax) contains structures known as halteres. These were originally a second set of wings, but have adapted over…



Source by Robert