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Horse flies and deer flies [a] are true flies in the family Tabanidae in the insect order Diptera. The adults are often large and agile in flight. Only females bite land vertebrates, including humans, to obtain blood. They prefer to fly in sunlight, avoiding dark and shady areas, and are inactive at night.
The "Spanish fly", Lytta vesicatoria, has been considered to have medicinal, aphrodisiac, and other properties. Human interactions with insects include both a wide variety of uses, whether practical such as for food, textiles, and dyestuffs, or symbolic, as in art, music, and literature, and negative interactions including damage to crops and extensive efforts to control insect pests.
On the other end of the spectrum, horse flies and deer flies use "blade-like" mouthparts to slash the skin before eating the spilling blood, which causes large, painful bites, Frye says.
Feeding by adult flies may cause irritation through acute stress from painful bites, resulting in loss of grazing time and reduced gain in weight. [6] Feeding by adult flies on the blood of their hosts exposes the hosts to pathogenic organisms that are infecting the fly, this can lead to acute disease of the host's blood and other organs.
The composition of dietary fat intake is linked to diabetes risk; decreasing consumption of saturated fats and trans fatty acids while replacing them with unsaturated fats may decrease the risk. [5] [8] Sugar sweetened drinks appear to increase the risk of type 2 diabetes both through their role in obesity and potentially through a direct effect.
Its presence affects recreational swimming, boating and fishing from April to June. [6] Yellow fly bites leave itchy welts. [4] DEET is the most useful insect repellent, though may not prevent bites if the yellow flies are in large numbers. In this case, physical barriers such as gloves and headnets are the only truly effective protection.
Sandfly or sand fly is a colloquial name for any species or genus of flying, biting, blood-sucking dipteran (fly) encountered in sandy areas. In the United States, sandfly may refer to certain horse flies that are also known as "greenheads" (family Tabanidae), or to members of the family Ceratopogonidae.
Tabanus bromius is one of the smaller European Tabanus, at about 13.5–15 millimetres (0.5–0.6 in) body length. [10] The mesonotum is grayish and bears on the top five indistinct longitudinal lines, while the abdomen is black, hairy and carries three rows of yellowish spots. The ventral side of the abdomen is light gray.