Horse fly

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Horse fly
Horse fly Tabanus 2.jpg
Tabanus sulcifrons
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Tabanidae

A horse fly is a type of insect and a member of the family Tabanidae (order Diptera), but more specifically are any member of the genus Tabanus. These stout flies, as small as a housefly or as large as a bumblebee, are sometimes known as greenheaded monsters; their metallic or iridescent eyes meet dorsally in the male and are separate in the female. Gad-fly, a nickname, may refer either to the fly’s roving habits or to its mouthparts, which resemble a wedge-shaped miner’s tool.

The bites of the female fly often carry parasites onto the victim (such as a horse). The resulting sore can be extremely distressing to the animal.