A horsefly is a large, biting insect belonging to the family Tabanidae. These flies are known for their painful bites, which they use to feed on the blood of mammals, including horses and humans. Horseflies are typically found in warm, sunny areas near water sources, as they require moisture for their larvae to develop. Horseflies are characterized by their robust bodies and large, multifaceted eyes. They are usually dark in color, with some species displaying bright markings. Unlike many other flies, horseflies are strong fliers and can be quite aggressive when seeking a blood meal. Their presence can be particularly bothersome during outdoor activities.