Do flies suck blood

Answer 1

There are quite a few flies that suck blood:

The horse fly and deer fly use their sharp mandibles to bite and suck the blood of their victims. Both look like normal houseflies, albeit without the long proboscis (the tube-mouth that most flies have.) Both flies are usually yellow-brown or black, and often have bright-green eyes. They generally suck the blood of livestock and mammals. Often, the bite from a horse fly can really hurt, so it's best to avoid them.

The stable fly also looks like a housefly (much more so than the horse or deer fly), but it's proboscis is longer and more rigid, like a mosquito's. They usually attack in early morn or late afternoon, and usually go for the ankles. As with the horse fly, stable flies often feed off of livestock.

Black flies, or "buffalo gnats", are large flies with a kind of hunchbacked appearance. They are often found near rivers. The bite from black flies often causes itching, swelling and other allergic reactions; some have even died from either Allergies or blood loss caused by a black fly bite.

Sandflies and biting midges, while technically midges and not flies, are often considered to be such by the general population. They are small insects that are often found around beaches at night (thus the name), and often attack the ankles. Sandflies can leave a nasty rash.

Answer 2

No, flies do not suck blood. Most flies feed on nectar, fruit, plants, or decaying organic matter. However, there are certain species of flies, such as horse flies and deer flies, that can bite animals, including humans, to feed on blood.