Horseflies

Source: https://en.wikipedia.org/wiki/Horse-fly

Horse-flies or horseflies (for other names, see common names) are true flies in the family Tabanidae in the insect order Diptera

Think about defining these terms. Will be hard

The mouthparts of females are formed into a stout stabbing organ with two pairs of sharp cutting blades, and a spongelike part used to lap up the blood that flows from the wound

In general, country-folk did not distinguish between the various biting insects that irritated their cattle and called them all "gad-flies", from the word "gad" meaning a spike.

Tabanids are agile fliers. Horseflies can lay claim to being the fastest flying insects

abanidae are classified in the superfamily Tabanoidea. Along with the Rhagionoidea, this superfamily makes up the infraorder Tabanomorpha. Tabanoid families seem to be united by the presence of a venom canal in the mandible of the larvae

females of most species are anautogenous, meaning they require a blood meal before they are able to reproduce effectively

The large animals and livestock mostly bitten by horse-flies are generally powerless to dislodge the fly, so there is no selective advantage for the flies to evolve a less immediately painful bite