Angelica sylvestris
The females of these flies are bloodsuckers, feeding on mammalian blood, mainly cattle and horses, but they can also bite humans. The males feed on nectar, especially on "Angelica sylvestris". The activity of these horseflies takes place in plain daylight, preferably in hot and muggy days and in the absence of wind. They are particularly aggressive during the full and late summer and bites cause painful welts.