Appearance
The dark giant horsefly's length is around 20-25 millimeters. They have uniform dark brown eyes.Dark giant horseflies are a common species to be found buzzing around cows and horses. They usually only suck blood from those horses and cows, avoiding humans. They fly with a very loud buzzing.
Distribution
"Tabanus sudeticus" is found in many countries of Western Europe. It has a marked northern and western distribution; being found as far north as southern Norway and the Western Isles of Scotland, and with an occasional record from Belarus.References:
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